Born in New York City, he was the son of Edward Carmen Rushmore and Mary Eliza (née Dunn) Rushmore, of Tuxedo Park, NY.
The couple were married on 23 June 1953 at Our Lady of Mt. Carmel Roman Catholic Church at Tuxedo Park, New York, where the Archduke and his mother the Dowager Empress Zita were said to live on a "large estate".
He grew up in Tuxedo Park, New York, and as an adolescent became interested in weather and climate.
In 1905, Hobson married Grizelda Houston Hull, cousin of U.S. Army general Joseph Wheeler, in Tuxedo Park, New York.
One of the new residences was built by Angier Biddle Duke, (cousin to Doris Duke), whose father-in-law, George Baker St. George, was an original resident of Tuxedo.
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Isabelle’s privileged upbringing included private East Coast schooling and several years of residence in Tuxedo Park, New York with her wealthy uncle Augustus D. Juilliard, who was the founder of the Juilliard School of Music.
His use of uncut stone was in keeping with both the principles of the American Arts and Crafts movement and other nearby rustic stone architecture, such as the gatehouse at the F.F. Proctor estate a few miles away and the structures built for Harriman and Bear Mountain state parks and the new gated community of Tuxedo Park.
Emily Post, a resident of Tuxedo Park, New York, stated in 1909 that "Tuxedos can have lapels or be shawl-shaped, in either case they are to have facings of silk, satin or grosgrain." and later republished this statement in her 1922 book "Etiquette", adding that only single-breasted jackets are appropriately called "Tuxedos".
Currently, Chisolm works as the head tennis professional at the Tuxedo Club in Tuxedo Park, NY.