Mary Courtney-O'Sullivan

Mary joined the EverWatch group of companies as Chief Financial Officer in 2022, bringing over 25 years of experience in the private equity industry.
Prior to joining EverWatch, Mary was the Founder and Managing Partner of MCOS Financial Solutions LLC, a boutique CFO consulting firm specializing in working with private equity, venture capital and hedge funds.
Prior to launching MCOS, Mary was the VP of Finance at Advent International, a global private equity firm, for over 20 years.
Through her tenure there, she served in financial roles in both Fund Administration and the Management Company, where her responsibilities included management of global finance and administration matters, implementation of a global ERP system and other ancillary systems, and a focus on building/enhancing best practices.
Mary also held positions at The Bank of New York Mellon, and PriceWaterhouseCoopers, serving clients in the real estate and financial services industries.
Mary received a BS in Business Administration from Stonehill College; and earned an MS in Taxation, with distinction, from Bentley University.
She is a Certified Public Accountant, a Chartered Global Management accountant, and a Certified Financial Planner.
Mary is an active member of the Private Equity CFO Association, Women’s Association of Venture & Equity, Financial Executives Alliance, Women in Alternative Assets, The CFO Leadership Council, and the Treasurer’s Club of Boston.