John Anthony McMahon ’71 is a distinguished business leader, investor, and dedicated servant leader whose career and volunteerism have spanned more than five decades. A graduate of Siena College with a B.S. in Finance, John built an accomplished career in financial services and international business, serving in leadership roles with Pacific Mutual and later with Johnson & Higgins, one of the world’s largest international insurance brokers, where he became both an equity partner and member of the Board of Directors. Following the firm’s acquisition by Marsh McLennan in 1997, he transitioned to private investing, focusing on private equity, venture capital, hedge funds, and public markets while also advising and serving on numerous corporate boards.
Beyond his professional achievements, John has demonstrated a lifelong commitment to education, healthcare, and faith-based service. He has served on the boards and advisory councils of institutions including University of San Diego, Loyola Marymount University, Siena University, and the UCLA Medical Center advisory board. His service also includes leadership roles with the Catholic Diocese of Los Angeles Finance Council, the Orange Catholic Foundation, and as Founder and Trustee of Cristo Rey High School Orange County. A devoted family man, John and his late wife, Joanne, raised four children and are the proud grandparents of nine grandchildren.