He learned to train horses at his cousin's ranch in Schellville where Larson Family Winery is located today.
Shortly after Santa Anita Park opened in Arcadia, California in 1934, Millerick was hired to condition horses for Charles Howard and would work under head trainer Tom Smith when the stable acquired Seabiscuit in 1936.
[2] In 1940, Millerick won his first major race for the Howard stable when Yankee Dandy captured the California Breeders' Champion Stakes.
"[3] During his career, Buster Millerick trained a number of racehorses including DeCourcy Graham's Kissin' George and Verne Winchell's Champion filly, Mira Femme.
[citation needed] After a short illness, Millerick died at age eighty on September 30, 1986, at Methodist Hospital in Arcadia, California.