The former co-chair of Paul, Weiss, Rifkind, Wharton & Garrison’s corporate department, Toby Myerson, is leaving the firm to form his own business advisory boutique at the start of next year.

Myerson leaves Paul Weiss after 33 years at the firm, where he has also served as co-head of global M&A. He advised clients including British Telecom in its unsuccessful hostile takeover battle with WorldCom over MCI Communications in 1997, Nextel Communications in its $35 billion merger with Sprint Corp. in 2005 and Citigroup in its sale of Citi Capital’s commercial loan and leasing business to GE Capital in 2008. Myerson also advised Citigroup on its acquisition of Nikko Cordial in 2007 and the bank’s unloading of that business in 2009 after the financial crisis.