Clyde Rettig Jr., 67, of Wellesley, Mass., passed away unexpectedly on Sept. 23.

He was the son of Clyde Rettig Sr. and the late Grace Rettig.

Mr. Rettig graduated from Butler High School in 1964, went on to graduate from M.I.T. and the Harvard Business School. A specialist in corporate strategy, he worked for a range of corporate clients.

Surviving are his wife, Cynthia of Wellesley; his father, Clyde Sr.; his sister, Darlene Huth and her husband, Joseph; his aunt Jean Baxter, all from Butler; as well as by nieces and nephews and grandnieces and grandnephews.

RETTIG — A memorial celebration for Clyde Rettig Jr., who passed away on Sept. 23, 2013, was in Boston at the M.I.T. Chapel.