our Leaders

Senior Leaders & Board Members

Senior Leadership 

John Naylor, Medica CEO

John Naylor


John Naylor is Medica's President and CEO. He is also a member of the board of directors of Medica Holding Company, which oversees our family of businesses.

Naylor has more than 30 years of industry experience. He joined Medica in 2010. As Senior Vice President of Commercial Markets, he led the achievement of record membership growth and developed a number of innovations, including accountable care organization products in partnership with health care systems across our service area. He became President and CEO in 2017.

Prior to joining Medica, Naylor spent 21 years at Willis Towers Watson (formerly Towers Perrin). For more than a decade, he served as the market leader for the company's Minneapolis office and Managing Director for the U.S. Central Region, with responsibility for all aspects of sales and service to clients across the company's human resources consulting practice.

Naylor serves on the board of Greater MSP and is a member of the Minnesota Business Partnership and the Itasca Project. These organizations are committed to strengthening the regional economy through programs that promote economic development, equality, and vitality. He also serves on the board of the Minnesota Council of Health Plans.

Naylor is a passionate volunteer with several community organizations, including the YMCA of the North, where he serves on the board. He earned a B.S.B.A. in actuarial science and accounting from Drake University.

Dan Abdul

Dan Abdul ensures that Medica makes sound technology decisions and benefits from its investments in information technology (IT) systems. His responsibilities include advancing technologies, establishing a robust enterprise architecture model, and overseeing all IT-related infrastructure, security, development, and delivery. He joined Medica in 2020.

Prior joining Medica, Abdul served as Senior Vice President and Chief Technology Officer, Data and Analytics, at Optum. He also has been the Chief Information Officer at UCare and the Minnesota Department of Veterans Affairs. 

Abdul earned an MBA in business strategy from the University of Minnesota and an M.S. in software engineering from the University of St. Thomas.  

He serves on the boards of directors at Ecumen, a nonprofit senior housing and services organization, and Mental Health Connect, a Minneapolis-based nonprofit that works to expand access to mental health services. In addition, he served for seven years in the Minnesota Army National Guard as a squad leader and flight medic.

Lynn Altmann

Lynn Altmann is responsible for human resources, diversity, equity & inclusion, employee experience, learning and facilities management, including building security, hospitality and office services. She reports to the CEO and is the executive representative to the Personnel & Compensation Committee of the Board of Directors. She came to Medica in 2000. Lynn has served in various leadership roles throughout Medica and has been a part of the executive team for more than 15 years. Previously at Medica, she was the Vice President of Talent Management, and held leadership roles in Medica's Contact Centers and Operations. She also was the VP, Executive Lead for Health Care Reform with responsibility for ensuring organizational readiness for the rollout of the ACA.

Before joining Medica, Lynn held positions at Optum, Lutheran Social Services and North Central College and Kishwaukee Community College. Lynn has a Master's Degree in Developmental Psychology and a Master's Degree in Child and Family Studies from Northern Illinois University.

Mark Baird

Mark Baird is responsible for overall financial management of Medica's business operations and investment activities. His accountabilities include finance, actuarial, health care economics, internal audit, and treasury. 

Baird has more than 35 years of health care and insurance industry financial experience. He has served in a variety of financial executive roles since he joined Medica in 2000. Prior to joining Medica, Baird was Chief Financial Officer of Utah-based IHC Health Plans (now SelectHealth). 

Baird earned an MBA in finance and quantitative methods from Brigham Young University.  

Geoff Bartsh

Geoff Bartsh is responsible for the overall strategic direction, performance, and growth of all Medica business segments and markets. He is accountable for Medica’s business performance, markets strategies, membership, sales, renewals, market expansion and growth.    

In previous roles at Medica, Bartsh was responsible for all aspects of the Individual and Family Business segment growing that business into a 9 state service area. Prior to that he served as the Vice President and General Manager over Medica’s Medicaid operations in Minnesota. His first role with Medica was Vice President of Public Policy, a role that gave him an opportunity to work on major legislative issues, including the Affordable Care Act. 

Bartsh earned a B.S. in political science from the University of Wisconsin-Madison. 


Paul Crowley


Paul Crowley leads Medica’s design, development and long term Product strategy to drive growth across all business segments and markets. He is accountable for product innovation and operations, sales effectiveness, as well as the finance and underwriting teams that support our sales and account management organization.    

Crowley has nearly 25 years of experience in the health benefits industry. In his previous role at Medica, he was responsible for all aspects of the Commercial segment. Prior to joining Medica, he held sales and consulting positions in the Chicago offices of Cigna and in the Boston offices of Willis Towers Watson (formerly Towers Perrin) and Aon Hewitt. 

Crowley earned a Master’s of Health Science degree in health finance and management from Johns Hopkins University. He is an active volunteer at his church and in his community. He’s also a youth basketball coach. 


Thomas H. Lindquist 


Thomas Lindquist is responsible for the strategic planning and plan operations for all of Medica’s product lines; this includes accountability for profit and loss, product development, compliance, product viability and growth, and operations for the business segments. Lindquist is also responsible for the organization’s relationship with the Minnesota DHS and Centers for Medicare and Medicaid Services. 

Before joining Medica, Lindquist held executive positions with UnitedHealth Group and served as a health insurance industry liaison to the Congressional Budget Office and the Centers for Medicare and Medicaid Services. 

Lindquist currently serves on the Board of Directors at MentorMN, on the Penn State Honors College External Advisory Board, and previously served on the board for the Institute for Clinical Systems (ICSI). He also provides volunteer math tutoring for students from elementary school through college.

He received his Bachelor of Science in Mathematics from Penn State University.

Dave Docherty

Dave Docherty directly oversees all business operations for Dean Health Plan and leads the organization's senior management team. In addition, he collaborates with SSM Health's care delivery leaders to develop and execute key strategic, clinical and operational priorities.
Since joining Dean Health Plan in 2007, Docherty advanced to chief growth officer where he oversaw strategy, business development, network development, product development (commercial and government programs), sales and retention functions. 

Prior to joining Dean Health Plan, Docherty served multiple roles at Fortune 500 organizations specializing in leading large strategic programs and merger/acquisition integration. 

He earned a Bachelor of Business Administration from the University of Wisconsin-Whitewater.

David Ellenbogen

David Ellenbogen provides strategic direction and oversight for legal affairs, compliance, privacy, regulatory affairs, government relations, and public policy. He joined Medica in 2020 with 20 years of experience as an attorney, most recently as General Counsel and Secretary at Scott & White Health Plan in Texas. Prior to that, he served in various legal capacities, including as Assistant Attorney General for the State of Texas, as an associate at Wienner & Gould P.C., and as a law clerk in the U.S. Tax Court in Washington, D.C., and the U.S. District Court in Detroit. 

Ellenbogen serves as a member of the national Governing Council of the American Bar Association Health Law Section. He previously served as Chair of the Fraud and Compliance Interest Group and as Vice Chair of the American Bar Association Health Law Section’s Managed Care and Insurance Interest Group. 

Ellenbogen earned a J.D. from the Washington University in St. Louis School of Law. 

Rob Geyer

Rob Geyer is responsible for ensuring Medica has the people, processes, and systems infrastructure in place for operations and IT to support our growth in products and geography. He joined Medica in 2019. 

Geyer most recently served as CEO of Reta Trust, a nonprofit health care trust that provides access to affordable, quality health care for U.S. employees of the Catholic Church. Prior to that, he served as Senior Vice President of Operations and Customer Quality for Blue Shield of California, where he held executive leadership positions for more than 19 years. 

Geyer earned an MBA from Pepperdine University.

Kelly Lindberg


Kelly Lindberg provides leadership and direction to ensure optimal customer experience. She is responsible for all marketing, branding, and consumer experience activities, including digital strategy, brand strategy, advertising, marketing communications, public relations, and member and provider communications. 

Lindberg has more than 20 years of experience defining strategy, driving organizational change, and delivering initiatives that result in enhanced consumer experience, operational efficiency, and growth. Before joining Medica, she served as Vice President, Consumer Experience, for Optum, where she led consumer-facing efforts for six key lines of business with more than 200 products. In support of that work, she built a new consumer-centric discipline and team to envision and create the desired experience across all consumer touchpoints and product lines. She also served in a number of roles at Target Corp., most recently as Director, Experience Design. 

Lindberg earned a B.A. from St. Catherine University. She is a regular volunteer at her local Animal Humane Society. 

John R. Mach, Jr., M.D.

John Mach, M.D., provides clinical representation and consultation to Medica's providers, customers, and other industry partners. He is also responsible for overall clinical leadership for our initiatives with providers to enhance clinical value — improving care at a lower cost — for the communities we serve. 

Dr. Mach has more than 35 years of medical and leadership experience across a broad range of roles. He most recently served as Chief Medical Officer for Evolent Health, providing oversight, leadership, and strategic direction in clinical quality and medical management for more than 30 provider partners that served Medicare, Medicaid, and commercial populations. Before that, he was President, Complex Care Management, at Univita Health Inc. Throughout his career, Dr. Mach has served as Chief Medical Officer at a number of organizations, including within UnitedHealth Group, where he was CEO of its Evercare division. 

Dr. Mach is a graduate of the University of Minnesota Medical School, where he also completed his residency in internal medicine. He also serves as Vice Chair of the board of trustees for the John A. Hartford Foundation, the nation’s oldest and largest private funder of geriatric care research and education.

Lori Nelson

Lori Nelson directs all provider network management, provider relations, and contracting activities. Those duties include development of financially sound contracting arrangements that deliver value for members, providers, and Medica. She is also responsible for driving ongoing provider network contracts and relationships that improve clinical and quality performance while supporting market expansion into new geographies. 

Nelson has more than 25 years of health care experience in all aspects of provider contracting, finance, and operations. Before rejoining Medica in 2017, she was Chief Operating Officer at Buckeye Health Plan in Columbus, Ohio. Prior to that, she was Vice President of Provider Relations at Blue Cross Blue Shield of Minnesota, and Director of Managed Care Contracts at Fairview Health Services. Nelson began her career in provider network-related operations at Medica as a manager of provider contracting. 

Nelson earned an MBA in finance and contracting from the University of St. Thomas.

Mary Quist

Mary Quist has responsibility for accounting, budgeting, financial analysis and reporting, and treasury management. Her role also includes compliance with financial and tax reporting requirements to various regulatory authorities, capital planning and analysis, and risk mitigation. She joined Medica in 2000.

Before joining Medica, Quist served as an accounting manager at Allianz Life and as an auditor for LarsonAllen. 

Quist earned a B.B.A. in accounting from the University of Wisconsin-Eau Claire. She is active in her community and serves on the board of the Minnesota chapter of the March of Dimes. 

Scott Reid

Scott Reid leads business development and strategic planning to support Medica’s short- and long-term business objectives. His responsibilities include developing Medica’s strategic plan and identifying partnership, acquisition, and transaction opportunities aligned with our overall business strategy.  

Reid joined Medica in 1997 as a Sales Executive and has served in various leadership roles including Vice President of Group Sales, Vice President of Product Strategy + Development, Vice President of Product and Operations, and Vice President of Growth Initiatives.  

Reid earned an MBA in Finance from University of Minnesota. He is an active volunteer for his local chapter of Special Olympics.

Board Members

John Buck


John Buck joined the Board in 2001. He is also a member of the Medica Foundation board and served as its Chair from 2002 to 2019.

Buck is CEO of Whitefish Ventures, which provides financial services and general business expertise to other companies. His previous experience includes serving as President and Chief Operating Officer at Fingerhut Companies, Vice President of Administration at Alliant Techsystems, and Vice President of Administration at Honeywell Inc. He previously served as Chair of the Board of Blue Cross and Blue Shield of Minnesota, and currently serves on the board of Patterson Companies Inc. 

Buck supports several charities in the Minneapolis-St. Paul and Naples, Fla., areas, including the United Way Foundation, the American Diabetes Association, and the Bascom Palmer Eye Institute. He is also a member of the Naples Education Foundation.

Rajesh Aggarwal, Ph.D.


Dr. Rajesh Aggarwal joined the Medica Board in 2008. He is a Professor of Finance at Northeastern University. He previously served as an Associate Professor at the University of Minnesota, the University of Virginia, the University of Michigan, and Dartmouth College. His areas of expertise include corporate governance, corporate finance, and corporate valuation. He also has an extensive background in the economics of organizations and has conducted research on bankruptcy, executive compensation, boards of directors, performance evaluation, and fraud. 

A frequent author and presenter, Dr. Aggarwal has coauthored articles on such subjects as performance incentives, the diversification of firms, and investment financing. In 2002, he received the MBA Elective Lecturer of the Year award from the Said Business School at Oxford University. In 2006 and 2007, the University of Minnesota’s Carlson School of Management named Dr. Aggarwal its Most Outstanding Full-time MBA Elective Faculty Member.

Brigid Bonner


Brigid Bonner joined the Medica Board in 2018. She is Chief Experience Officer of CaringBridge, a global nonprofit social network dedicated to helping family and friends communicate with and support loved ones during a health journey. Bonner has expertise in retail, health care and technology industries and enjoys driving digital transformation. Her previous experience includes serving as Senior Vice President, Digital Marketing at Schwan’s Home Service; Senior Vice President, Strategy and Planning for Optum; Chief Information Officer for UnitedHealth Technologies; VP and General Manager, Target Direct; and Principal of B. Bonner Consulting. 

Bonner serves on the board of Workiva and previously served on the boards of Analysts International, Minneapolis Heart Institute Foundation and Fairview Physician Associates. She enjoys playing an active role as a mentor to others.

Peter Kelly, M.D., MHA


Dr. Peter Kelly joined the Medica Board in 2001. He practices bariatric surgery as a member of the M Health Fairview Comprehensive Weight Management Program. Dr. Kelly serves as the Vice President and Executive Medical Director for M Health Fairview’s Peri-Operative Services, as well as the Senior Medical Director for the General Surgery service line. He has served in multiple leadership positions over his career, including as Chief of Surgery for the HealthEast surgery department, President of the HealthEast medical staff, and President of the Ramsey County Medical Society. 

Dr. Kelly is involved in numerous professional associations and community activities. He also makes annual trips to Guatemala to provide medical and surgical care to the country’s indigent population.

Samuel Leon, M.D.


Dr. Samuel Leon joined the Medica Board in 2001. He also serves on the Medica Foundation Board of Directors. Dr. Leon previously served as President of MNGI Digestive Health, and Vice Chief of Medicine at Methodist Hospital. He also has served as Clinical Assistant Professor at the University of Minnesota School of Medicine and has coauthored several articles in medical journals. 

Dr. Leon is a past member of the Boards of Directors of MNGI Digestive Health and Fairview Physician Associates.

Gaye Adams Massey


Gaye Adams Massey joined the Medica Board in 2020. In her role at YWCA St. Paul, she directs the nonprofit’s work to promote racial justice and gender equity; provide supportive housing, job training, and youth development programs; and operate a health and fitness center. Prior to joining the YWCA St. Paul, she was a Senior Deputy General Counsel for UnitedHealth Group and General Counsel of its Ovations business. She also has served in legal leadership positions with QualChoice Health Plan and Aetna Inc., and practiced law with Crowell & Moring. 

Massey is a fellow of the American Bar Foundation. She has served on many nonprofit boards, including Way to Grow, Children's Minnesota, and Hartford Community Health Services. She currently serves as trustee of the Lawyers Committee for Civil Rights, and as a member of the President’s Advisory Council of Saint Paul College and the Ramsey County Workforce Innovation Board.

Judge John M. Stanoch


Judge John Stanoch joined the Medica Board in 2014 and serves as Vice Chair. In addition, he is Chair of the Medica Foundation Board of Directors. 

Judge Stanoch previously served as President of Qwest Communications in Minnesota and North Dakota, as Minnesota's Chief Deputy Attorney General, and as a Hennepin County District Court Judge. After a career in business and the public sector, he also held executive leadership positions in the civic sector, including as President and CEO of Ronald McDonald House Charities of the Upper Midwest, Interim President of the Science Museum of Minnesota, and Interim CEO of the Minneapolis Regional Chamber of Commerce. 

Judge Stanoch has been active in a range of community and professional organizations and currently serves on the boards of AchieveMpls (the strategic nonprofit partner of the Minneapolis Public Schools), Creating Healthier Communities, the Board of Visitors of the University of Wisconsin-Madison College of Letters and Science, and the Minnesota Council of Churches Foundation. He has also served as Chair of the Science Museum of Minnesota’s Board of Trustees, Chair of the Minneapolis Regional Chamber of Commerce Board of Directors, President of the Minnesota District Judges Association, and on the board of the Minnesota Business Partnership.

Earl D. Stratton


Earl Stratton joined the Medica Board in 2009. Prior to his retirement in 2015, Mr. Stratton served as CIO for TCF Financial Corp. He had been with TCF since 1985. Prior to that, he worked at Huntington National Bank in Columbus, Ohio, for 15 years. 

Stratton previously served on the Boards of Directors of TCF National Bank and C Financial Corp., an Ohio bank holding company headquartered in Columbus.

Mary Twinem


Mary Twinem joined the Medica Board in 2015. She also serves on the Medica Foundation’s Board of Directors. Prior to her retirement in 2016, Twinem served as Executive Vice President, CFO, and Treasurer of Buffalo Wild Wings Inc. She took on that role after serving as the company’s Controller from January 1995 to July 1996, and as a director of the company from June 2002 to September 2003. Prior to that, she served as the Director of Finance and Controller of Dahlberg Inc., the parent company of Miracle-Ear hearing aids, from 1989 to December 1994. 

Twinem started her career in public accounting and holds an inactive CPA license. She serves on the public company boards of Valvoline Inc. and Centerspace. 

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