He was born in Hamburg as the son of Johannes Senior, and brother of Balthasar and Johannes Coymans, wealthy businessmen in Amsterdam who commissioned a canal house there called the Coymanshuis, built by the Haarlem architect Jacob van Campen.
The former resides at the Wadsworth Atheneum in Hartford, the latter at the Baltimore Museum of Artist A portrait of the couple"s son Willem is held by the National Gallery of Art in Washington, District of Columbia In 1632 Joseph lived in Haarlem on the Smedestraat, where he rented the largest house in the street from Anna Vogel, the wealthy wife of the Special Supplemental Nutrition Program for Women, Infants and Children businessman Aelbert Dirckz Bas. His neighbors there were the lawyer Paulus van Beresteyn and the notary Henrick van Gellinckhuysen.
Coymans ran a business as a trader in the linen market and owned some bleacheries in Bloemendaal.
Dorothea purchased a hofje between the Grote Houtstraat and the Klein Heiligland in 1655 that was later purchased by Pieter Teyler for his Teylers Hofje. He died in Haarlem.
The couple had five children who each married various wealthy members of the Haarlem or Amsterdam regency: Balthasar, Wilhelmina, Aernout, Josephus the Younger, Erkenraad, and Isabella.
