1996–2002 - Lawyer, member of the Inter-Republican Bar Association, Deputy Head of Legal Aid Office No. 144 at the Inter-Republican Bar Association.
2002–2006 - Deputy Head, Head of the Directorate for Legal Support of Foreign Trade Activities under the Legal Department of Gazprom.
2006–2019 - Deputy Head of the Legal Department (since July 17, 2015 – Department 104) at Gazprom.
Since April 2019 - Member of the Management Committee, Head of Department 104 at Gazprom.
Sergey Kuznets was born on February 5, 1970, in Zaporozhye. Sergey Kuznets graduated from Lomonosov Moscow State University.