Five Lakes Medical

Our Executive Team

A leadership team that brings together deep expertise in healthcare operations, real estate investment, and strategic advisory — united by a commitment to building lasting value in medicine.

Jonathan R. Hargrove, Chief Executive Officer
General

Jonathan R. Hargrove

Chief Executive Officer

Jonathan leads Five Lakes Medical's overall strategy and operations across all three entities. With over two decades of experience in healthcare administration and private equity, he has overseen the development and management of physician practices, medical real estate portfolios, and healthcare advisory engagements spanning multiple specialties and markets.

MBA, University of Michigan Ross School of Business
Fellow, American College of Healthcare Executives
Dr. Margaret L. Chen, Chief Medical Officer
Management

Dr. Margaret L. Chen

Chief Medical Officer

Dr. Chen bridges the clinical and operational sides of Five Lakes Medical Management. A practicing internist with extensive experience in practice management, she ensures that every operational decision is grounded in clinical reality and physician-centered values. She leads credentialing, compliance, and physician relations across all managed practices.

MD, Johns Hopkins School of Medicine
Board Certified, Internal Medicine
Certified Physician Executive, ACPE
David A. Whitmore, Chief Investment Officer
Investments

David A. Whitmore

Chief Investment Officer

David oversees Five Lakes Medical Investments' acquisition strategy, capital partnerships, and portfolio management. His background spans healthcare real estate, private equity, and structured finance, with a track record of identifying and executing on high-value medical office and outpatient facility opportunities across the Midwest and Southeast.

MS Real Estate Finance, NYU Stern
Certified Commercial Investment Member (CCIM)
Sarah K. Okonkwo, Chief Operating Officer
Management

Sarah K. Okonkwo

Chief Operating Officer

Sarah drives operational excellence across Five Lakes Medical Management's portfolio of partner practices. With a background in healthcare systems management and revenue cycle optimization, she leads the teams responsible for staffing, practice operations, and RCM — ensuring every partner practice operates at peak efficiency.

MHA, Ohio State University
Certified Revenue Cycle Professional (CRCP)
Thomas J. Reilly, Managing Director, Consulting
Consulting

Thomas J. Reilly

Managing Director, Consulting

Thomas leads Five Lakes Medical Consulting's advisory practice, working directly with health systems, physician groups, and healthcare organizations navigating strategic transitions. His consulting work spans market entry strategy, practice acquisition advisory, payer contract negotiation, and organizational restructuring.

MBA, Northwestern Kellogg School of Management
Former Partner, Healthcare Advisory Practice
Lisa M. Fontaine, General Counsel & Chief Compliance Officer
General

Lisa M. Fontaine

General Counsel & Chief Compliance Officer

Lisa oversees all legal, regulatory, and compliance matters across the Five Lakes Medical enterprise. Her practice focuses on healthcare law, physician contracting, MSO structure and compliance, and real estate transaction counsel. She ensures every engagement is structured to protect both the company and its physician and investor partners.

JD, Georgetown University Law Center
Member, American Health Law Association

Work With Our Team

Our leadership team is directly involved in every engagement. Reach out to start a conversation about how Five Lakes Medical can support your practice, investment, or organization.

Contact Us
Five Lakes Medical

A family of healthcare companies built on partnership and precision.

Five Lakes Medical Management, LLC

Operational excellence for physician practices.

MSO Services →

Five Lakes Medical Investments, LLC

Strategic capital for healthcare real estate and facilities.

Investment Overview →

Five Lakes Medical Consulting

Advisory and strategy for healthcare growth.

Consulting Services →

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