On 26th of December 1991, Dan got married to Eileen Cregg. Eileen Cregg is a beautiful lady. They were together as husband and wife for about a decade but they didn't have any children. They got divorced in 2001. Besides this married life, there is no any information about his love affairs and his girlfriend.
Dan received his formal education from Lindenhurst Senior High School. He graduated from there in 1965 and after his graduation, he served there as their physical education teacher. He joined US Marine Corps in the early 1970s and worked there for about three years. While he was in US Marines, he toured in Vietnam as a Vietnam War veteran. He also got enrolled at Southern Connecticut State University. While he was there he became more interested in acting. He has been active in acting since 1981. In 1985, he appeared in the TV series Scarecrow and Mrs. King where he played the role of Rogan. His breakthrough role as an actor came in 1988 after he began starring the role of Jack Arnold in the TV series The Wonder Years. He has been earning lucrative amount of salary as an actor and his net worth is said to be around $4 Million.