OakLeaf Staff

Jeffrey L. Tucker, MBA, EFPM

Chief Executive Officer

Jeff Tucker is a healthcare executive, entrepreneur and longtime advocate for independent medicine with more than 35 years of experience in healthcare leadership, strategy, physician relationships and organizational development.

Most recently, Jeff served as Vice President of Business Development & Care Innovation for Marshfield Clinic Health System, where he led strategic growth initiatives, developed partnerships with physicians, hospitals, employers and communities, and helped create new approaches to delivering care across Wisconsin and surrounding rural markets. His work included development of mobile and virtual care models, employer health strategies, physician partnerships and other initiatives designed to improve healthcare access and strengthen local care delivery.

Prior to joining Marshfield Clinic, Jeff spent more than two decades working with independent physicians and medical practices in Minnesota and Wisconsin. He served as President and CEO of Integrity Health Network, an independent physician organization representing more than 200 physicians and healthcare providers across nearly 50 clinics and facilities. During his tenure, the network expanded its payer relationships, developed total-cost-of-care and value-based contracts, created an Accountable Care Organization, and built shared programs and services designed to help independent practices remain strong and competitive.

Jeff has been recognized twice by Minnesota Physician as one of the Top 100 Influential People in Healthcare and previously received its Outstanding Achievement recognition. He has served on numerous healthcare and community boards and was appointed a commissioner to the Wisconsin Governor’s Blue Ribbon Commission on Rural Prosperity. He is also a U.S. Air Force veteran, entrepreneur and author of Warmed by Windchill.

Jeff lives with his wife, dog, and cat in the Eau Claire area and is excited to return to his roots working alongside independent physicians and clinics and to help build the next chapter of OakLeaf Medical Network.

Molly Thoennes, M.Ed.

Operations Manager – HIPAA Privacy Officer

Molly Thoennes joined Independent Physician Management (IPM) and OakLeaf Medical Network (OLMN) in March 2025, bringing more than 15 years of experience in clinical operations, physician practice management, quality improvement, and healthcare administration. In her role as Operations Manager, she supports the day-to-day operations of the organization and works closely with independent physician practices to strengthen operational efficiency, foster collaboration, and support the continued success of independent medicine.

Molly earned her Master of Education in Applied Kinesiology, Sport and Exercise Science from the University of Minnesota and her Bachelor of Science in Athletic Training from Northern Michigan University. Her professional background provides a strong foundation in both clinical care and healthcare administration, allowing her to bring a practical, collaborative approach to supporting physicians, clinic leaders, and their teams.

Born and raised in a rural community on her family’s dairy farm, Molly developed a strong appreciation for hard work, family, and community. She continues to live locally with her husband, Matt, their son, Lane, and their dog, Tuff. Outside of work, Molly enjoys spending time with family, baking, quilting, working on puzzles, and embracing the simple pleasures of life.

Merrilee Severino, CPC, CPCS, CRC, CMMP, CMP

Senior Credentialing and Payer Enrollment Specialist

Merrilee Severino is an accomplished healthcare operations and revenue cycle consultant with more than 30 years of hands-on experience guiding medical practices, specialty groups, and healthcare organizations nationwide. As the founder and principal of Your Business Medic and a former Senior Consultant at CliftonLarsonAllen (CLA), she specializes in bridging the gap between clinical documentation, provider credentialing, and sustainable revenue generation.

Her expertise spans the full revenue cycle continuum, including delegated credentialing, payer enrollment workflows, fee-schedule optimization, and compliance auditing. Notably, Merrilee has served as an Independent Coding Officer for healthcare entities operating under corporate integrity agreements with the Office of Inspector General (OIG). She was also asked to collaborate with Availity on the book Paper Kills.

A dedicated educator and industry author, she has served on the editorial board of BC Advantage Magazine and frequently presents webinars and workshops for major industry bodies, including NAMSS, AAPC, The Coding Institute, and PAHCOM. Merrilee holds multiple industry credentials covering medical coding, risk adjustment, provider credentialing, and medical practice management.

She resides in Kansas with her teenage daughter, two dogs, two cats and six dogs and has a love of “granny hobbies”, which include baking, gardening, and canning.

Maddison Hayes, RHIA

Epic Systems Analyst – HIM – Information Security Officer

Maddison Hayes serves as one of our Epic Application Analysts and Information Security Officer. With more than 10 years of experience in health information management and revenue cycle operations, Maddison brings extensive knowledge of healthcare technology, clinical and business workflows, and information security.

Since beginning her career in healthcare as an outpatient coder, Maddison has advanced through roles in Health Information Management (HIM), coding and clinical documentation integrity, and healthcare IT application analysis. Her experience includes successful Epic implementations, application design and development, workflow optimization, revenue cycle process improvement, and technical support across multiple healthcare systems. She currently supports Epic Garden Plot, with multiple areas of focus.

In addition to her application analyst responsibilities, Maddison serves as the Information Security Officer for IPM, supporting the organization’s information security and HIPAA compliance efforts. Her background in health information management and healthcare technology provides a valuable foundation for balancing operational needs with the protection of sensitive information.

Maddison holds a Bachelor of Science in Health Informatics and Information Management from Missouri Western State University and is a Registered Health Information Administrator (RHIA). She holds Epic certifications in HIM Hospital Coding, HIM Release of Information, HIM Deficiency Tracking, and Identity. Maddison is committed to continuous improvement, collaboration, and leveraging technology to enhance healthcare operations while supporting the providers, staff, and patients served by OakLeaf Medical Network.

Outside of work, Maddison lives in the Kansas City area with her husband, Chad, and their three cats, Sullivan, Gilbert, and Arnie. She is also a Jazzercise FitPro, combining her love of fitness with her passion for helping others stay active. In her free time, Maddison and Chad enjoy traveling and spending time on the water, where they can often be found boating at Lake of the Ozarks and Table Rock Lake.

Megan Moore

Epic Systems Analyst – EpicCare Ambulatory

I started my career as a nurse and eventually made the move into healthcare
technology, where I’ve been a Clinical Systems Analyst since 2012. So, I’ve gone from taking care of patients to troubleshooting computer systems — and trust me, both require patience, problem-solving, and caffeine!

Outside of work, I love traveling with my boyfriend, bowling in my league (I’m always aiming for a strike, even if the gutter has other plans), and cheering on the Milwaukee Brewers. I enjoy all kinds of music, but heavy rock definitely tops my playlist. Nothing beats a great concert, a little casino action, or discovering a new place to explore. I also enjoy cooking, and trying new foods. Life is too short to keep ordering the same thing off the menu!

I’m a proud mom to one daughter who attends Iowa State University, and I’m also a dog mom to my Puggle, Gemini, who probably thinks the house revolves around her. Spoiler alert: she might be right.
I love making memories, laughing until my stomach hurts, exploring new places,enjoying good food, and spending time with the people who matter most. I believe life is meant to be enjoyed, laughter is essential, and you can never have too much music, too many adventures, or too much ice cream!