In the 17th and 18th century, the Burckhardts intermarried with the other leading families of the Basel patriciate (Iselin, Merian, Sarasin, Staehelin, Vischer, Wettstein).
A member of The Jockey Club, Iselin and Amory L. Haskell headed a group of investors who founded the Monmouth Park Jockey Club in 1944 to build a new Thoroughbred horse racing facility in Oceanport, New Jersey.