Kirkland-and-Ellis-offices-Gherkin-St-Mary-Axe_shutterstock_450671263 Credit: Melinda Nagy/Shutterstock.com

Kirkland & Ellis former London head and private equity star James Learner is to retire from the firm this year.

Learner is set to leave the U.S. firm after a total of 30 years at the outfit, according to two people with knowledge of the matter.

He joined Kirkland in Chicago in 1987 and was part of the team that helped launch a base in the U.K. capital in 1994.

He relocated to London in 2000 to lead the office as well as the firm's European operations. During that time, he also served as a member of the firm's global executive committee.

In 2011, he advised a consortium consisting of private equity houses Bain Capital and Hellman & Friedman on its £2.1 billion buyout of Swedish private equity firm EQT's European alarm and security company Securitas Direct.

The following year, he left the firm to join U.S. private equity firm Huntsman Gay as managing director, based in its Palo Alto branch.

Three years later, he returned to the London office of Kirkland as a partner.

His work principally involves representing private equity firms in their leveraged buyout and growth capital investing and in their fund formation activities, acting for key client Bain Capital as well as other private equity houses including Cinven, Apax Partners, Apollo Management and Towerbrook Capital Partners.

Last year, he was part of the elite U.S. firm's team advising Bain and Cinven when it bought German pharmaceutical company Stada for €5.3 billion.

Kirkland and Learner did not respond to requests for comment.