Who We Are

Mary Pat Thurston
President & CEO
Mary Pat Thurston, a native New Yorker, is a founding partner of both Global Excess Partners and GEP II. As Partner and COO, Mary Pat's role focuses on marketing and product development. She has played a large part in the expansion and growth of the GEP brand and has been responsible for the addition of five new binding authorities for the company as well as the renegotiation of current binding authorities.

In her position as a founding member of Global Excess Partners, Mary Pat fostered the development of Ambridge Partners, LLC. Ambridge Partners, LLC is a specialized managing general underwriter of Transactional, Management Liability, Contingency and Specialty Management Liability Insurance products.

Mary Pat owned and managed a successful personal real estate portfolio of New York City real estate from 1980 to 1996.

Ms. Thurston began her career in the business development department of the one of the country's largest engineering and architectural firms, where she quickly rose after developing a system to streamline, monitor and evaluate all proposals for new business. Over the years, this led Ms. Thurston into providing similar services for a diverse group of companies ranging from travel to publishing.

Timothy J. Guiltinan
Executive Vice President
Tim Guiltinan joined GEP II in November 2001 as Senior Vice President. He is an approved named correspondent for GEP's Lloyd's Inland Marine Facility and Middle Market facility. He is also an approved correspondent for the International Insurance Company of Hannover Limited.

Tim heads both the Middle Market and Inland Marine Departments for GEP. His responsibilities also include development of Specialized Property Programs and new facilities for GEP. Mr. Guiltinan is licensed as a broker in all 50 states.

Tim has more than 30 years experience as a Property and Inland Marine Underwriter. His responsibilities have included overseeing Inland Marine Operations for both the US and Canada.

Prior to joining GEP, Tim worked held various senior positions at AIG, Reliance National and Johnson & Higgins. Mr. Guiltinan was a contributing editor to Inland Marine Insurance, Volume 1 published in 1987 in association with IMUA. Tim is a past Skipper of the New York Mariners Club. Tim has participated on several committees for the IMUA, including the Educational Committee. Tim is a past member of the Insurance Risk Management Institute. He is a proud graduate of Manhattan College, Bronx. NY.

Brendan K. Cook
Vice President
Brendan Cook joined GEP in July 2017 as Vice President and head of Middle Market Underwriting operation. His day to day responsibilities include oversight of the underwriting team and growth of the portfolio.

He brings over 30 years’ experience from both the United States and his native Australia and has held various roles within the insurance industry notably at General Reinsurance in Sydney, Australia.

Prior to joining GEP, Brendan started and ran the retail property underwriting operation at QBE North America for 7 years.

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