San Diego-based restaurant operator and franchiser Jack in the Box Inc has anounced that its president and COO Kenneth R. Williams will retire at the end of the calendar year. Williams, 59, joined the company in 1966 as a restaurant manager/lessee, and has held a variety of positions with the company, including executive VP, of marketing and operations. He was elected president, COO and a member of the Jack in the Box board of directors in 2001.