[1] He graduated with a bachelor of arts degree in Economics from the University of California, Santa Barbara.
[4] Mullin co-founded the M Financial Group with Mark Solomon, Carl Mammel, and Eli Morgan in 1978.
[2] Headquartered in Portland, Oregon,[7] it offers life insurance and other financial services to "the ultra-affluent and corporate markets.
[1] Moreover, Mullin has served on the board of trustees of the Art Center College of Design in Pasadena since 2011.
[3] Additionally, he served on the board of trustees of the Saint John's Health Center, a Roman Catholic hospital in Santa Monica, California, where the Mullin Plaza and the Mullin Gardens were named in his honor in 2013.
[3] In 2018, Mullin attempted to open a classic car museum in England, situated at Enstone Airfield, West Oxfordshire.
[20][21] Mullin and his wife Merle resided in Brentwood, a suburb on the West side of Los Angeles.
[22] They owned property in Umbria, Italy, where they made "olive oil, wine, honey, and raised Cinta Senese pigs for prosciutto.