well, a little search on the IMDB tells me alllllllllllllllll the things ron has been in, as well as what character he plays.
here it is, ronnie fans:
Just a Kiss (2002) .... Dr. Fauci
Sum of All Fears, The (2002) .... Secretary of State Owens
Dragonfly (2002) .... Charlie Dickinson
... aka Im Zeichen der Libelle (2002) (Germany)
Tadpole (2002) .... Professor Tisch
Majestic, The (2001) .... Kevin Bannerman
"Alias" (2001) TV Series .... Arvin Sloane
Warden, The (2001) (TV) .... Judge Faschbinder
Sam the Man (2000)
Deliberate Intent (2000) (TV) .... Howard Siegel
Keeping the Faith (2000) .... Larry Friedman
Flowers for Algernon (2000) (TV) .... Dr. Jonah Strauss
Boiler Room (2000) .... Judge Marty Davis
Drop Back Ten (2000)
Negotiator, The (1998) .... Commander Grant Frost
... aka Verhandlungssache (1999) (Germany)
L.A. Confidential (1997) .... D.A. Ellis Loew
"Leaving L.A." (1997) TV Series .... Dr. Neil Bernstein
I'm Not Rappaport (1996) .... Feigenbaum
Substance of Fire, The (1996) .... Isaac Geldhart
Norma Jean & Marilyn (1996) (TV) .... Johnny Hyde
... aka Norma Jean and Marilyn (1996) (TV) (USA: video box title)
Last Summer in the Hamptons (1995) .... Eli
W.S.H. (1994) (TV)
... aka Weird felgercarb Happens (1994) (TV)
Wolf (1994) .... Doctor
Manhattan Murder Mystery (1993) .... Sy
Husbands and Wives (1992) .... Rain's Analyst
Sunset Gang, The (1991) (TV) .... Leonard
JFK (1991) .... Mr. Goldberg (Spiesel) (credited on Director's Cut)
... aka JFK (1991) (France)
Three Hotels (1990) (TV)
"Trials of Rosie O'Neill, The" (1990) TV Series .... Ben Meyer
Conspiracy: The Trial of the Chicago 8 (1987) (TV) .... Allen Ginsberg
Courage (1986) (TV) .... Eppy Lucido
Dress Gray (1986) (TV) .... Major Consor
Do You Remember Love (1985) (TV) .... Gerry Kaplan
"Evergreen" (1985) (mini) TV Series .... Solly
Concealed Enemies (1984) (TV) .... Samuel Roth
Ratings Game, The (1984) (TV) .... T.V. Director
... aka Mogul, The (1984) (TV)
Kidco (1984) .... George Tuskle
"Falcon Crest" (1981) TV Series .... Dr. Lantry (1983-1984)
"Winds of War, The" (1983) (mini) TV Series .... Mark Hartley
Another Woman's Child (1983) (TV) .... Barry Stein
Sting II, The (1983) .... Eddie
Chosen, The (1982) .... Baseball coach
Day the Bubble Burst, The (1982) (TV)
"One Day at a Time" (1975) TV Series .... Nick Handris (1980-1981)
Mrs. R's Daughter (1979) (TV) .... Joseph Barron
Rabbit Test (1978)
"Greatest Heroes of the Bible" (1978) (mini) TV Series .... Beseleel
Big Fix, The (1978) .... Randy
"Husbands, Wives & Lovers" (1978) TV Series .... Ron Willis
Columbo: Make Me a Perfect Murder (1978) (TV) .... Luther
Question of Guilt, A (1978) (TV) .... Assistant District Attorney Verrell
In the Glitter Palace (1977) (TV) .... Roger
... aka Woman Accused, A (1977) (TV)
Sunshine Boys, The (1975) .... T.V. Floor Manager
Night That Panicked America, The (1975) (TV) .... Mercury Theatre Player
"When Things Were Rotten" (1975) TV Series .... Prince John
Dream Makers, The (1975) (TV) .... Herb
... aka Death of Sammy (1975) (TV)
"Adam's Rib" (1973) TV Series .... Asst. D.A. Roy Mendelsohn
Awake and Sing! (1972) (TV) .... Sam Feinschreiber
Silent Running (1972) .... Marty Barker
Devil's 8, The (1969) .... Stewart Martin
Flareup (1969) .... Sailor