Partner Joseph Gramm
University of Connecticut, Storrs, CT 06269, Stati Uniti
Saint Lawrence Cemetery, 280 Derby Ave, West Haven, CT 06516, Stati Uniti
Ronald Gabriel "Ron" Paolillo (April 2, 1949 – August 14, 2012) was an American television and film actor and teacher. He was best known as Arnold Horshack on the ABC sitcom Welcome Back, Kotter (1975–79).
Ronald Gabriel Paolillo (he used the surname "Palillo" during his acting career) was an american born in New Haven, Connecticut to Gabriel and Carmel Paolillo, of Italian descent. and raised in Cheshire. He graduated from the University of Connecticut at Storrs, where he taught  during the late 1990s. Palillo attended Fairfield University while pursuing a postgraduate degree.
After Welcome Back, Kotter, Palillo appeared in leading and supporting roles in various television series and films. He was a panelist on an episode of Match Game PM in 1977. He voiced characters on such animated series as Laverne & Shirley in the Army, Darkwing Duck, and Rubik, the Amazing Cube, in which he played the lead character. In 1996, Palillo played himself in several episodes of the television sitcom Ellen, playing Audrey (Ellen's friend's) love interest. Palillo also spent a year on the popular daytime show One Life to Live and also acted in Friday the 13th Part VI: Jason Lives (1986), and the lead in The Curse of Micah Rood. 
He returned to New York in 1991, and played such roles as Mozart in Amadeus and regionally as George in Who's Afraid of Virginia Woolf?, Arthur in Camelot and Nathan Detroit in Guys and Dolls. He appeared on Broadway in 2008 in Broadway Backwards 4, a charity event benefiting Broadway Cares/Equity Fights AIDS and The Lesbian, Gay, Bisexual & Transgender Community Center. Among his other New York City credits were a one-person show in 2000 where he portrayed Nazi criminal Adolf Eichmann in The Diary of Adolf Eichmann off-Broadway. Palillo, in a newspaper interview in 1997, said he lamented his role as Horshack as he was permanently typecast, which he believed had damaged his career.
As a director, Palillo directed successful productions of the musical Three Guys Naked From The Waist Down in Los Angeles, AA Closer Walk With Patsy Cline, and a new edition of Phantom Of The Opera at the Cuillo Center for the Arts in West Palm Beach, Florida. In 2007, he introduced a new clothing line specializing in limited-edition T-shirts produced by Rotter and Friends. Palillo was also an artist, providing artwork for two children's books: The Red Wings of Christmas and A Gift for the Contessa. 
In 2005, his first full-length play, The Lost Boy,, the true story of Peter Pan author J. M. Barrie, premiered at the Helen Hayes Theatre in Nyack, New York, and later played at the Queens Theatre in the Park, in Queens, New York and at the Eldorado's Springs High School in Eldorado Springs, Missouri.
HHe taught freshman drama at G-Star School Of The Arts for Motion Pictures and Broadcasting in Palm Springs, Florida.
PPalillo and his partner of 41 years, Joseph Gramm, lived in Palm Beach Gardens, Florida. On August 14, 2012, Palillo suffered a heart attack at his home and was taken by ambulance to a nearby hospital, where he was pronounced dead on arrival.
Palillo's funeral service was held in Palm Beach Gardens on August 22, 2012. He is buried at St. Lawrence Cemetery, West Haven, Connecticut. A memorial tribute, directed by Lawrence Leritz and hosted by Tyne Daly, was held to honor and celebrate Palillo's life and career at NYC's The Triad Theatre, October 3, 2012.