Aaron Marks Courtesy photo

Aaron Marks, one of the leading partners at Kasowitz Benson Torres, is leaving the firm to join Kirkland & Ellis, sources familiar with the move told the Law Journal on Friday. Marks confirmed his move, but declined to comment further.

Although other partners have left Kasowitz Benson this year, Marks is the most high-profile exit. He was part of the firm’s inner circle, and he has served as a right-hand partner of founder Marc Kasowitz. He oversaw many of the day-to-day managing functions, including recruiting and working with associates.

Kirkland and Kasowitz representatives did not immediately respond to messages seeking comment on Marks’ move.

His departure and others earlier this year come while the firm has been under national media scrutiny. President Donald Trump retained Marc Kasowitz as his personal lawyer amid investigations into possible collusion between the Trump campaign and Russia.

But this summer, Kasowitz moved back from that representation. Kasowitz would have a “lower profile” on the Trump team, though he remained a part of it, according to partner Michael Bowe in July.

Other partner exits at the firm this year including Charles Miller, who practiced for 11 years at Kasowitz Benson, and who moved in July to Tarter Krinsky & Drogin. A pair of commercial litigators, Christopher Johnson and Zachary Mazin, left in May to join McKool Smith.

Marks is one of the first attorneys at Kasowitz Bennon when the firm formed in 1993, joining right after his law school graduation that year.

He is one of the lead partners on major matters for the law firm, including defending AMC Networks Inc. in a profit-sharing suit launched against the network by a creator of the hit series “The Walking Dead.” He was also a lead Kasowitz lawyer for cigarette manufacturer Liggett Group Inc., one of the firm’s earliest clients.

He has represented major private equity firms—one of the main client industries at Kirkland & Ellis. According to his firm profile, Marks has represented Apollo Management, Bain Capital, Carlyle Group, Centerbridge Capital Partners, Clayton, Dubilier & Rice, Fortress Investment Group and others in disputes over acquisitions and acquisition financings for leveraged buyout transactions.