Born Oct. 8, 1933, in Center Bridge, Pa., to Jane Patton and Casimir Sienkiewicz, a prominent Philadelphia banker, John was in his turn prominent.
At Princeton he was a popular and admired classmate who won the varsity football award for Most Improved Player. He served as class president from 1965 to 1970, Cottage Club’s board chairman for 10 years, and president and CEO of international operations of Alexander & Alexander, the world’s largest retail insurance broker. He was an active member of the U.S. Senior Golf Association — as well as a fine player — and bellwether of 1955’s entry in the annual Princeton Football Association Golf Outing and Fundraiser. John was a loving, strong, and supportive husband, father, and friend; an avid traveler; and a widely philanthropic and generous donor to many organizations.
He died in his sleep of a massive heart attack Jan. 3, 2012, at home in Loblolly in Hobe Sound, Fla. Predeceased by his wife of 50 years, Patricia, and his brother Bur Sienkiewicz, John is survived by sons Mark and Peter; his second wife, Maisie Barlow Sienkiewicz; his brother Michael and wife Marika; sister-in-law Jone Sienkiewicz; and many classmates and friends who loved him dearly. A memorial service is planned for June in Princeton.