From TheChels.info - The Chelsea Football Club Wiki
Eugene Tenenbaum (born in Kiev, USSR in 1964) is a long time associate and adviser to Chelsea owner Roman Abramovich, and sits on the club board, having helped with Abramovich's takeover of the club in 2003. He is also the the Managing Director of MHC-Services Ltd (Millhouse UK), and on the board of Evraz Group SA and Highland Gold Mining Limited. 
Tenenbaum emigrated to Canada as a child, in 1975, and holds a bachelors degree in commerce and finance and a degree in economics from University of Toronto, from where he graduated in 1987 with distinction. He qualified as a Canadian Chartered Accountant with Price Waterhouse in Toronto where he worked in the audit department from 1987 until 1989.
From 1994 until 1998, he worked at Salomon Brothers, and was a director in the corporate finance unit of the investment bank. Prior to that, he spent five years in corporate finance with KPMG in Toronto, Moscow and London, including three years (1990-1993) as National Director of KPMG International in Moscow. From 1998 until 2001, he was the head of corporate finance for Sibneft (Siberian Oil Company) in Moscow, then co-owned by Abramovich.