Weil, Gotshal & Manges has brought in Williams & Connolly partner John Villa to defend it from allegations of unethical conduct related to advice it gave financial services firm Perella Weinberg Partners over the tax treatment of two executives’ deferred compensation.

Ex-Perella investment bankers Michael Kramer and Derron Slonecker, who are represented by Lisa Solbakken of Arkin Solbakken, accused Weil earlier this month of failing to disclose that the deferred-compensation forms at the center of their dispute with Perella didn’t comply with tax laws. Perella’s withholding of more than $10 million in deferred comp from the departed bankers was therefore invalid, they argued.