The revolving cast of lawyers representing Steven Donziger against accusations that he rigged a fraudulent environmental judgment against Chevron Corp. is shifting yet again. This week the embattled New York lawyer packed on new legal muscle for the epic fight, including an up-and-coming U.S. Supreme Court advocate, two law professors, and even a group of eager law students.

Donziger announced on Thursday that he’s being advised by Deepak Gupta, 36, of the Washington, D.C., appellate boutique Gupta Beck. Prior to founding the firm, Gupta worked at Public Citizen, Ralph Nader’s consumer watchdog group. Gupta has argued on behalf of plaintiffs in several recent Supreme Court cases, including the high-profile arbitration challenge AT&T Mobility v. Concepcion.