Michael Howard Diamond, who worked closely with billionaire entrepreneur Ronald Perlman and the late Brandon Tartikoff as executive vice president and general counsel of New World Communications Group, died at his home in Los Angeles on Saturday after a long a battle with cancer. He was 73.

Diamond was a litigation partner at Skadden, Arps before overseeing the construction of the firm’s L.A. office. He subsequently headed the litigation division for Milbank, Tweed.

In recent years, Diamond founded his own company, MHD Group, which was devoted to mediation and legal counsel services. He represented the interests of other major companies, including Disney.

Diamond attended Brown University and Columbia University Law School, where he graduated magna cum laude.

He is survived by his wife, Marilyn Diamond, to whom he was married for 30 years; children Seth, Cory, Beth and Debra Diamond; and a number of grandchildren.

Services are private, but donations may be made to Tower Cancer Research Center in Beverly Hills.