Cassini also participated and won the 5th Annual RFK Pro Celebrity Tennis Tournament in 1976. The silver winner's cup was presented to him personally by Jackie Kennedy Onassis. Cassini competed professionally in the sport of harness racing. In 1985 he earned a professional harness racer license and won races at the Meadowlands Raceway, Yonkers Raceway, Freehold Raceway, Monticello Raceway, and Roosevelt Raceway. He received awards in recognition of his efforts to support equine charities from "HORSE" and "The Equine Society" which recognized Cassini with its Man of the year award. He participated in golfing events, scoring three holes in one at the Deepdale Golf Club and one hole in one at the Westhampton Golf Club. Cassini also participated in the ABC TV Superstars Competition. Oleg Cassini received the James Herriot Award ("All Creatures Great and Small") as the Man of the Year from the Humane Society of the United States for his work and care for animals. He created collections of manmade fashion fur, the 'evolutionary furs'. In 1999, he was awarded the Humanitarian Award at a fashion show and Gala at the National Building Museum in Washington, DC, honorary chairpersons Eunice Shriver and Senator Ted Kennedy, show hosted by Montel Williams. Among the 40 models were movie star Tippi Hedren. In his own words "What we're designing is as elegant and attractive as fur and eliminates the enormous cruelty that goes on in the killing of animals for fur." In his autobiography Cassini claims to have suggested to President Kennedy that he take steps to organize The Bureau of Indian Affairs, the action which led to the American Indian Movement. Cassini was named an honorary member of the Chickasaw and Navajo nations in 1981 due to his fund raising and organization of gala charity events for the tribes. Cassini and his brother, Igor under the pen name of society columnist Cholly Knickerbocker, threw "The Knickerbocker Charity Balls" to raise money for the tribes. An author of best-selling books, "In My Own Fashion", "A Thousand Days of Magic: Dressing Jacqueline Kennedy for the White House" a book which is a tribute to Jacqueline Kennedy and reflects the magical period of Camelot and the "Jackie Look", and "Oleg Cassini: The Wedding Dress". Cassini appeared on hundreds of television shows worldwide in many languages and also hosted a special 13-part TV series, "Conversations with Cassini", on the Arts & Entertainment Network.