Donald D. Van Demark

He was born December 28, 1944 in Brooklyn, NY, son of Charles Joseph and Edna (Carren) Van Demark of Spotswood, NJ.

Don was the beloved husband of Barbara for almost 50 years, devoted stepfather of Matthew Dieter, cherished grandfather of Kaelie and Luke, all of St. Petersburg, FL, and loving brother of the late Charles T. Van Demark and family of Myrtle Beach, SC.

He graduated from Bishop Loughlin Memorial High School in 1962, where he served as yearbook editor and excelled in track. Don graduated from Manhattan College in 1965 with a degree in Mechanical Engineering. He earned his MBA from the University of Pittsburgh in 1967. Don was nearing completion of his PhD. in Business Law from CCNY when his employer, Caltex Petroleum, transferred him to Bangkok, Thailand in 1969.

Don spent over 35 years as an oil executive for a variety of firms including Caltex and Coastal Petroleum working in a variety of locations including Thailand, the Philippines, Dubai, Dallas, Taiwan, and Kuwait.

The family extends heartfelt thanks to the dedicated doctors, nurses and staff at Greenwich Hospital and the staff of Visiting Angels Home Care for their compassionate care and support during the 10 years of Don’s illness.

He is reposing at Leo P. Gallagher & Son Funeral Home, 31 Arch Street, Greenwich, CT 06830. A viewing will be held there on Tuesday Jan 20, 2026 from 9:00 - 10:00 am. A church service will be held immediately afterward at St. Catherine of Siena Church, located at 4 Riverside Avenue, Riverside, CT 06878, at 10:30 am.

Don will be entombed at The Cemetery of the Holy Rood in Westbury, Long Island.

In lieu of flowers, donations can be made in Don’s name to the American Lung Association at https://action.lung.org/site/Donation2?df_id=31272&mfc_pref=T&31272.donation=form1&array=new