Born in New York, but raised in Rome, Italy, Montaigne speaks several languages, a skill he used to his advantage in securing roles in international productions.
In 1966, Montaigne portrayed the Romulan Decius in the Star Trek episode "Balance of Terror". A year later, he portrayed the Vulcan Stonn, a paramour of Spock's intended bride T'Pring, in the episode "Amok Time" - a role that he reprised in 2006 in the unofficial mini-series Star Trek: Of Gods and Men.
In addition, he guested on Batman, The Man From U.N.C.L.E., Mission: Impossible, The Time Tunnel, The Invaders and McCloud.
His motion picture appearances include roles in The Great Escape, Tobruk, The Power, Escape to Witch Mountain and Deadly Blessing.
Montaigne taught film in the 1980s at North Texas State University (now University of North Texas).
For the last several years he has lived in Las Vegas, Nevada and has translated medical texts for a publishing firm.