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The Senior Leadership Team


Michael J. Clark, President- Mr. Clark has over 20 years of insurance industry experience almost all of it spent as a senior executive within the aviation and aerospace sector. Prior to founding Plimsoll he served as the Head of the Aviation and Aerospace Business Unit at QBE, reporting directly in to the North American Board. He and the team founded the Aviation Division there as a de novo greenfield endeavor in 2011, in a 50/50 Joint Venture with QBE’s Aerospace Syndicate at Lloyd’s of London, and quickly turned the business unit into one of the largest and most profitable underwriters in the global marketplace within this highly specialized segment.


He has founded multiple aviation and aerospace specialty programs that continue to be some of the largest and most profitable in the industry. His responsibilities as a senior aviation insurance executive have included oversight of underwriting,  claims, safety & Loss Control and Finance teams. He has held responsibility for overseeing placement of aviation reinsurance treaties covering large portfolios of primary insurance business and has extensive experience designing and implementing quantitative pricing models, many of which continue to be in use by various underwriters.

Prior to QBE, he served for 10 years as a Senior Vice President at Old Republic Aerospace, where he led the Special Risk Division, overseeing a multidisciplinary team and a portfolio of specialty aerospace business in excess of $50,000,000 USD in annual revenue.

 Mr. Clark has an undergraduate degree in Political Science and is a 2008 graduate of the Thunderbird School’s top ranked European Based Executive MBA Program. He is a former U.S. Marine, an avid runner and an aviation enthusiast. He lives in Atlanta Georgia with his three daughters and his wife of 20 years.

William P.  McGloin, COO- Mr. McGloin has over 40 years of Aviation Insurance Experience. He is the founder of Old Republic Aerospace, which he began as a joint venture with Old Republic International Group in 1983. He served as President of Phoenix Aviation, which ultimately grew to over 160 million USD in gross written premium, until 2011 when he left with a small team to found QBE’s Aviation operations in North America. He served as the EVP of QBE’s North American Aerospace Division until 2013 when he retired and transitioned this role to Michael Clark.


Prior to founding Old Republic Aerospace, Mr. McGloin served as a senior executive at Southeastern Aviation which was acquired by AIG in 1983 and became AIG’s Aviation and Aerospace Division. Bill has been a pilot since receiving his private pilot certificate at the age of 16. He lives in Atlanta and continues to be an active pilot and aircraft owner.

Greg Vassilious, Vice President Finance- Mr. Vassilious has over 35 years of insurance and reinsurance underwriting experience. He served as VP of Operations and Compliance for the aviation team at QBE and as VP of reinsurance operations at Old Republic Aerospace. Prior to joining Old Republic, Mr. Vassilious served for over 20 years at Everest Re and Prudential Re where he lead the Aviation and Marine reinsurance team, overseeing both treaty and facultative operations worldwide.

William Bertles, Managing Director, Claims- Mr. Bertles has over 35 years of claims management experience. He served as the senior claims officer at both QBE Aerospace and Old Republic where he held ultimate responsibility for oversight of the entire aerospace and workers’ compensation claims teams, for setting reserving practices and creating and overseeing adherence to litigation management guidelines.

Philip A. Wagner, Chief Marketing Officer- Mr. Wagner brings with him over 20 years of commercial aviation insurance underwriting and program administration experience with some of the most respected names in the aviation insurance marketplace, including AIG and Old Republic Aerospace. He is a 1996 graduate of the University of Georgia’s Risk Management and Insurance program. He was part of the original team at Plimsoll where he currently holds responsibility for overseeing Plimsoll’s carrier relations and placement strategy.

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