He attended Samuel J. Tilden High School, and first became interested in the arts by wanting to pursue a career as an opera singer.
From the early 1950s to 1991, Dubin worked in television, directing episodes of Tales of Tomorrow, Omnibus, The Defenders, The Big Valley, The Virginian, Hawaii Five-O, M*A*South*H, Matlock, The Rockford Files, Murder, She Wrote and among other notable series. After graduating from high school, he attended Brooklyn College, studying drama, and acted in a number of stage productions, before graduating in 1941. He then attended Neighborhood Playhouse in Manhattan studying stage managing and directing.
He continued to act and sing in stage productions working as an understudy.
In 1950, he was hired by American Broadcasting Company, as an associate director and, within a few months, was soon promoted to head director, later going on to direct a number of notable series spanning 30 years. In 1958, Dubin was named in the Hollywood blacklist.
He refused to testify and he was never cited for contempt. He directed more episodes of the popular 1970s television comedy M*A*South*H than anyone else.
Dubin retired in 1991 at the age of 70, after 39 years in television and 48 years in entertainment.
His last television directing cr was the series Father Dowling Mysteries starring Tom Bosley. On September 5, 2011, Dubin died of natural causes, he was 92 years old.