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Collins was commissioned to paint more than seventy-five of the leading racehorses of her time, including Citation, commissioned by Nat Herzfeld former President of Tropical Park Race Course, Chrysler II and By Jimminy for Walter P. Chrysler, Dom Bingo for Bing Crosby, Tom Fool for Jock Whitney, and Discovery and Bed o'Roses for Alfred Gwynne Vanderbilt, Jr.
A lover of horses and a polo enthusiast, Robert Lehman played on a polo team with Averell Harriman, Jock Whitney and Tommy Hitchcock, Jr..
Although best remembered for his affiliation with King Ranch, in California he trained horses for several other prominent owners from the East Coast such as Harry Isaacs, Alfred G. Vanderbilt II, Joan and Jock Whitney's Greentree Stable as well as Edward Lasker and his wife, the actress Jane Greer.
Radio and TV talk show pioneers John Reagan "Tex" McCrary, and his wife, model and movie star Jinx Falkenburg, with their sons Kevin "Jock" McCrary and John Reagan "Paddy" McCrary, lived on and off the Jock Whitney estate from 1947 to 1977.