Our Team

Sean Heyniger, Founder and CEO

Mr. Heyniger founded Watermark Medical in 2008 and has over 30 years of experience building healthcare service organizations and delivering innovative solutions to the healthcare market. Mr. Heyniger began his career with PSS/World Medical in 1989 as a sales representative. He quickly climbed within the company holding various sales leadership positions. The company rapidly grew during his tenure to over $1.8 billion in gross revenue. Mr. Heyniger’s accomplishments at PSS/World Medical included CEO roundtable member for top 1% producers and Vice President of Corporate Development with responsibilities in acquisitions, pioneering new distribution centers, and sales and management training.

Mr. Heyniger pursued an entrepreneurial vision for expanding remote monitoring services to the physician market by Co-founding PDSHeart in 2000. He had the vision of bringing world-class sales and a direct distribution network to serve an expanding remote cardiac monitoring business. PDSHeart was the first to receive the Joint Commission Accreditation in the cardiac diagnostic sector. PDSHeart was recognized by Inc, Magazine as one of the Top 1,000 Fastest-Growing Companies in America in 2006 and received a South Florida Technology award. In March 2007, Mr. Heyniger successfully negotiated the sale of PDSHeart to CardioNet, a national wireless cardiac monitoring company.

Mr. Heyniger believed that the market for sleep breathing disorders was equally ripe for an innovative delivery model when he founded Watermark Medical in 2008 by rapidly disrupting the delivery of sleep diagnostic services through the primary care channel. Today, Watermark is considered a pioneer and leader in the advancement of home sleep diagnostic services.

He attended the University of Maryland in College Park and Florida State University in Tallahassee, where he graduated with a B.S. in Social Sciences. Sean was born in Groton, Connecticut, and currently resides in Palm Beach, Florida, with his wife and six children.

Jack Fiedor, President and CFO

Mr. Fiedor has over 30 years of diverse finance and operational leadership experience. He joined Watermark Medical in 2009 as CFO. In addition to his financial leadership role, he has held various other senior leadership positions, including Chief Operating Officer, and currently serves as President. He is responsible for leading all financial, operational, and strategic initiatives of the Company.

Before joining Watermark Medical, Jack served as Vice President and Chief Accounting Officer of SBA Communications Corporation (SBAC, NASDAQ), one of the largest publicly traded global owners, developers, operators, and servicers of wireless communications towers.  During his tenure with SBAC and in addition to his senior financial leadership role, he was involved in the Company’s aggressive acquisition, and integration of numerous national independently owned and operated wireless service providers and was responsible for all SEC financial reporting and compliance.

Before working for SBAC, Jack held executive-level financial positions with several national real estate companies, including; Vice President and Chief Financial Officer of The Rendina Companies, a developer, owner, and manager of a portfolio of medical office properties with a value in excess of $500 million, and two years as Director of Financial Reporting for a Florida retail real estate investment trust with a portfolio value in excess of $300 million.

Jack began his career with the professional services firm of Ernst & Young LLP in West Palm Beach, Florida, where, as Senior Manager, he was responsible for managing a portfolio of diverse audit and consulting clients.

Jack holds a Bachelor of Science in Accounting and Finance from Florida State University. He is a Florida certified public accountant and member of the AICPA. He resides in Wellington, Florida, with his wife and three children.

Greg Poulos, Chief Operating Officer and Chief Information Officer

After graduating from the University of Georgia, Greg Poulos worked as a Senior Consultant and Business Analyst for Cap Gemini for a number of different industries and companies, including QDS/WebMD.

Greg was recruited away from Cap Gemini by a start-up company and client Monorail Computer Corporation.  As Vice President of Systems Development, Greg was responsible for the development of large scale proprietary systems in the areas of product development, manufacturing, order management, inventory tracking, and product support that allowed Monorail to launch the first sub $1000 PC to the market and eventually process and manufacture all of the “builds to order” PCs for one of IBM’s primary home PC product lines.

After five years in the PC business, Greg went back to the Cardiac Healthcare industry as Executive Vice President of IT for PDSHeart. While at PDSHeart, Greg was responsible for all infrastructure and software development related to the business. He was also directly involved in the development of many key systems like four times transmission speeds and electronic enrollment and reporting systems that allowed for a more than 50% reduction in labor. He also differentiated PDSHeart in the cardiac market place.

After the sale of PDSHeart to CardioNet, Greg was awarded the job as head of IT for CardioNet as the Vice President of IT.  While at CardioNet, Greg oversaw all IT operations, including the successful integration of PDSHeart.  During Greg’s time at CardioNet, revenues reached $100M, and the company successfully completed its IPO with a market cap of $600M.

Greg is now Watermark Medical’s Chief Information Officer, where he will oversee the design and development of all operational and business management systems in the sleep apnea services area.

Gregory A Marsh, Vice President Transactions

Mr. Marsh has been working with Watermark in his current role and, prior to that, as a Company consultant since May 2016. Mr. Marsh’s primary responsibility has been coordinating recent transactional activity related to Watermark’s sale of numerous business segments in 2019. In addition, Mr. Marsh provides support and input around the Company’s ongoing initiatives and business development opportunities.

Mr. Marsh has over 35 years of financial and management experience, including CFO responsibilities for public and private companies and nine years of Public Accounting experience with Coopers and Lybrand. Mr. Marsh’s healthcare experience spans 25 years, with a primary emphasis on healthcare diagnostics companies. Before joining Watermark, Greg served as the CFO for Sentry Data Systems, Aurora Diagnostics, PDSHeart (CardioNet), and AmeriPath. Mr. Marsh has deep experience in mergers and acquisitions, having completed over 75 acquisitions and numerous successful exits for his companies. Mr. Marsh also has extensive experience in raising capital, including private equity, senior credit facilities, and both public equity and debt issuances.

Mr. Marsh holds a Bachelor of Science in Accounting from Slippery Rock State College. He is also a CPA and an active member of the FICPA and AICPA. He and his wife reside in Palm Beach Gardens, FL.