Fireblocks lists him on its own about page as "Chief Executive Officer, Co-Founder", alongside Pavel Berengoltz as chief technology officer and Idan Ofrat as chief product officer.
The company's account of its own origin places all three at Check Point in 2017, on the task force that investigated the theft of bitcoin from four South Korean exchanges, and describes the founding decision as moving from securing mobility, cloud and critical infrastructure to securing blockchain key material. A company press release dates the business itself to 2018.
The technical approach he is publicly associated with is multi-party computation applied to custody: rather than protecting one private key in one place, key shares are held separately and produce a signature jointly. Fireblocks has since added a New York chartered trust company and a product line covering stablecoins, tokenisation and payments.