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John serves as Mandiant’s President and Chief Operating Officer. He has served in various roles with Mandiant and FireEye since iSIGHT Partners was acquired in 2016 including serving as Chairman of the FireEye Advisory Board from April 2020 to April 2021, Executive Vice President and Chief Strategy Officer from February 2018 to April 2020, Executive Vice President of Global Services and Intelligence from January 2017 to January 2018, and President of iSIGHT from January 2016 to January 2017.

Prior to joining Mandiant, John served as founder, Chairman and Chief Executive Officer of iSIGHT Partners from December 2006 to January 2016. From 2003 until its acquisition by Verisign in 2005, John was Chairman and Chief Executive Officer of iDEFENSE, a security intelligence firm. Prior to entering the cyber security industry in 2003, John served in a variety of roles in the investment industry, including General Partner of several investment funds as President and CEO of Dorset Capital Corporation, an investment firm, since 1998. From 1994 to 1998, he served as founder, Chairman and CEO of EFO Holdings, a wealth management firm responsible for managing the investments of the Esping Family and several other wealthy families. He spent his first 6 years in the investment business in NYC, most recently as Vice President of Wealth Management at Bankers Trust.

John is also the founder, director and President of the STAIRS Program, a non-profit organization supporting inner-city education, since 2000. John holds a B.S.C. degree in Finance from Santa Clara University and has served on dozens of corporate and non-profit board of directors.