Keogh was born in San Francisco in 1922 and studied at the Chouinard Art Institute in Los Angeles. His work as a costume designer took him to New York where he met and married Theodora Roosevelt, the granddaughter of President 'Teddy' Roosevelt. The couple moved to Paris where Keogh found work with French Vogue. His career at this point was more successful than his marriage, which soon ended in divorce after a series of tit-for-tat affairs. His editorial contributions to the magazine helped him gain work from Elizabeth Arden, Galeries Lafayette, for whom he designed Christmas windows, and Jean Desses.
After twenty years in Paris Keogh returned to New York where he made witty and stylish fashion illustrations for New York magazine. He died at the age of just 58 in 1980. His lifelong friend, costume designer Willa Kim, said of him, 'He didn't really want to be a costume designer or a fashion illustrator. He wanted to be a serious artist but he never took it seriously'.