Gary Slack 

Member, Summit Advisory Board

Gary Slack, who joined the Advisory Board in September 2017, has 30 years of experience in government contracting, financing, and administration. Slack is president and CEO of XLA, a management consulting firm that primarily serves the federal government. He formerly worked for i4Business Advisors, QinetiQ, and BAE Systems. He sits on multiple boards, including Enterprise Ventures Corporation, JWF Industries, and LemonFish Technologies. He serves as a resource on consulting engagements, and his strategic advice has helped Summit navigate a challenging federal procurement environment.


Summit's Advisory Board consists of key players in the consulting and data science fields. This board advises Summit Partners on industry trends and how to navigate federal and commercial industries.

advisory board headshots