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.