Cantor was born on an Air Force base in California. When his father, an Air Force captain and flight surgeon, finished his service, the family moved to Philadelphia. They moved a few more times (Newton Center, Massachusetts and Cherry Hill, New Jersey) as his father completed his internship and residency, and settled in Bergen County.
His father was (and is still) involved in community theatre and his mother is a painter. Both of them enjoyed the arts and this resulted in Cantor's appreciation as well, especially the theater. "We were sort of progressive, liberal, Jewish people. I grew up in a time when were sort of at the cutting edge of that."
While attending Amherst College, Cantor came to find acting the most rewarding and intriguing art form, particularly British theatre which he found the most inspirational. Geoffrey graduated magna cum laude from Amherst College with a degree in theater, and furthered his acting education at Eugene O'Neill Theater Center and then at the Royal Central School of Speech & Drama in London, England.
He made his TV acting debut in Night Network before appearing in a variety of television shows such as The Street, The Kill Point, All My Children, Life on Mars, Law & Order: Criminal Intent, Deception and House of Cards He gained sudden recognition in 2015 for his role in Daredevil as Mitchell Ellison, the editor-in-chief of the New York Bulletin and boss to Ben Urich.
(Source : Wikipedia)
He is in the Foundation cast list (Season 1 - 2021) as Ambassador Thanwall and is present in 3 episodes.