John Glover (/ˈɡlʌvər/ born August 7, 1944[1]) is an American actor, known for a range of villainous roles in films and television, such as Lionel Luthor in Smallville and the voice of Riddler in the DC Animated Universe.

[5][6] Glover began his career at the Barter Theatre in Abingdon, Virginia, and later studied acting at the Beverly Hills Playhouse under Milton Katselas.

[7] Glover began his career in television, playing a mentally disturbed kidnapper who kidnapped Joanne, the lead character in Search for Tomorrow.

His other roles include Alan Raimy in 52 Pick-Up, Bryce Cummings in Scrooged, Tony Gateworth in Masquerade, Daniel Clamp in Gremlins 2: The New Batch, a mobster in Payback, an advertising spokesman in RoboCop 2, Derek Mills in Night of the Running Man, the Riddler in Batman: The Animated Series, Doctor Jason Woodrue in Batman & Robin, Verad in the Star Trek: Deep Space Nine episode "Invasive Procedures", the Devil in the series Brimstone, and a recurring role in The Days and Nights of Molly Dodd as Cousin Jerry, from Bal'mer, a relative whom no one actually seemed to know.

He appeared in the role of Max Brodsky, an inmate in concentration camps and later a fighter for Israel's independence, in Ian Sharp's 1989 TV miniseries Twist of Fate (also known as Pursuit).

[9] He had a small appearance in the Woody Allen film Annie Hall (1977) in a flashback in which he tells the title character, "Touch my heart.

He had a recurring role in Law & Order: Criminal Intent as Declan Gage, an old friend and mentor to Detective Robert Goren.

In October/November 2011, he performed in David Bar Katz's drama The Atmosphere of Memory at the Bank Street Theatre in New York City, co-starring with Ellen Burstyn in a LAByrinth production.

He played the role of Uncle Ben in the 2012 Broadway production of Arthur Miller's Death of a Salesman, directed by Mike Nichols.