Overview
Marc Zionts is a retired software CEO and investor [1][2]. Zionts earned a Bachelor's degree in Industrial Design and a Master's degree in Management, both from the Georgia Institute of Technology [11][12]. Zionts served as Chief Executive Officer and Board Member at SundaySky from January 2024 to March 2026, and currently holds the position of Investor and Retired CEO at the company [3][4]. Prior to this role, Zionts served as Chief Executive Officer at Synacor from November 2021 to December 2023 and as Strategic Advisor there from December 2023 to April 2025 [6][7]. Zionts also served as Executive Chairman at Precision Nutrition from May 2019 to November 2021 and as Strategic Advisor from November 2021 to April 2025 [8][9]. Additionally, Zionts has served as Board Director, Treasurer, and Chair of the Finance and Development Committees at Friends of the Earth U.S. since March 2015 [5].
Profile introduction
Marc Zionts is a retired software CEO, private equity–backed executive, board member, and advisor, with a long track record of leading and scaling technology companies. Most recently, he served as CEO of SundaySky, where he led the company through a period of transformation and growth before retiring from his full-time operating role. Zionts earned both his Bachelor’s and Master’s degrees from the Georgia Institute of Technology. He currently serves as a Board Director, Treasurer, and Chairman of the Finance and Development Committees at Friends of the Earth, a Washington, D.C.–based environm…
Career history
- Investor and Retired CEOMar 2026 to presentSundaySky
- Chief Executive Officer & Board MemberJan 2024 to Mar 2026SundaySky
- Member Board of Directors, Treasurer, Finance Committee Chair and Development Committee ChairMar 2015 to presentFriends of the Earth U.S.
- Strategic AdvisorDec 2023 to Apr 2025Synacor
- Chief Executive OfficerNov 2021 to Dec 2023Synacor
- Strategic AdvisorNov 2021 to Apr 2025Precision Nutrition
- Executive ChairmanMay 2019 to Nov 2021Precision Nutrition
- Member Board of DirectorsAug 2014 to Jun 2022TEOCO
Education
BS, Industrial DesignGeorgia Institute of Technology
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