AT&T was the main sponsor of the tournament for its final editions, held at Valencia Country Club in Santa Clarita, California.

The tournament was founded in November 1990 as the "Security Pacific Senior Classic" at Rancho Park Golf Club,[2] a municipal course in the city of Los Angeles, where it was played through 1994.

Rancho Park hosted the Los Angeles Open on the PGA Tour from 1956 through 1972 (except 1968).

The purse for the inaugural event was $500,000 with a winner's share of $75,000.

[2] From 1995 through 2000, it was played at Wilshire Country Club, then moved north to Valencia in March 2001.