I went back in the old Company PR's and found where He was temporarily employed by Electrovaya.

https://electrovaya.com/press/steven-berkenfeld-has-been-engaged-by-electrovaya-as-special-advisor/

Founder and principal of Ecotopia Consulting, Mr. Berkenfeld retired as a Managing Director in Investment Banking at Barclays where he served as senior sponsor of the Environmental and Social Impact Banking Initiative, was co-head of the firm’s Cleantech Initiative and led the banking effort for Emerging Industrial Technology companies.

Mr. Berkenfeld is the former Chair of the Board of the Sierra Club Foundation, and is currently Chair of the Board of Green City Force, a member of the Board of Directors of The Clean Fight, and a member of the President’s Council of Ceres and Woodwell Climate Research Center.