Background
Frelinghuysen was born in East Hampton, New York, the son of Joseph Sherman Frelinghuysen, Senior, a New Jersey state senator and later United States. senator
Frelinghuysen was born in East Hampton, New York, the son of Joseph Sherman Frelinghuysen, Senior, a New Jersey state senator and later United States. senator
He graduated from Princeton University in 1934.
During World World War II, he served as an artillery captain in the First Infantry Division in North Africa where he was captured on November 23, 1942 by German troops and taken to a prison camp in Italy. He and another American Prisoner Of War escaped on September 23, 1943 and rejoined allied forces. After the war, Frelinghuysen worked in insurance and later managed the family dairy business in Somerville, New Jersey.
At the end of his life, he was living in Far Hills, New Jersey and died of pneumonia in Morristown.
In 1916 he was painted as a young boy, with his mother Emily Brewster Frelinghuysen, in a full length portrait by the Swiss-born American artist Adolfo Müller-Ury, which was later donated to the Newark Museum, New Jersey.