Yankee Review

"He's a neurosurgeon at St. Joseph's Hospital..."
Academy Award-nominee Seymour Cassel plays Bert Fischer, Max's father. Cassel describes his character as being "the opposite of Max, much more reserved, but he encourages his son to be who he wants to be, or who he thinks he wants to be. He just loves him a lot and allows him to experiment with life." 

Credit: Rushmore press kit

About Seymour Cassel...
Seymour Cassel earned widespread acclaim and an Academy Award nomination for his performance with Gena Rowlands in John Cassavettes' Faces. He also starred in two other Cassavettes films Minnie and Moskowitz and Love Streams and has worked with many other great filmmakers including Sam Peckinpah (Convoy), Ken Russell (Valentino), Barry Levinson (Tin Men), Nicolas Roeg (Track 29), and Warren Beatty (Dick Tracy).  He has always been a champion of independent filmmakers and recently starred in the Sundance Film Festival award-winning In the Soup, Steve Buscemi's Tree Lounge, and the Hughes' Brothers' Dead Presidents. 

Credit: Rushmore press kit

Seymour Cassel's Filmography
Rushmore (1998) 
Dream for an Insomniac (1998) - Uncle Leo 
Relax... It's Just Sex (1998) - Emile Pillsbury 
Motel Blue (1997) - Old Priest 
Seed (1997) - First Client 
Obsession (1997/I) - Jacob Frischmuth 
This World, Then the Fireworks (1997) - Police detective Harris 
Cannes Man (1996) - Sy Lerner 
Dead Girl (1996) 
Last Home Run, The (1996) - Older Jonathan 
Cosas que nunca te dije (1996) - Frank 
Caméléone (1996) - Francis 
Sfagi tou kokora, I (1996) 
Trees Lounge (1996) - Uncle Al 
Anything for John (1995) 
Dead Presidents (1995) (uncredited) - Saul 
Dark Side of Genius (1994) - Samuel Rourke 
Handgun (1994) - Jack McCallister 
It Could Happen to You (1994) - Jack Gross 
Tollbooth (1994) - Larry/Leon 
Imaginary Crimes (1994) - Eddie 
Chasers (1994) - Master Chief Bogg 
Boiling Point (1993) - Virgil Leach 
There Goes My Baby (1993) - Pop 
When Pigs Fly (1993) - Frank 
Indecent Proposal (1993) - Mr. Shackleford 
Adventures in Spying (1992) - Ray Rucker 
Chain of Desire (1992) - Mel 
Honeymoon in Vegas (1992) - Tony Cataracts 
Love Is Like That (1992) - Uncle Bud 
Trouble Bound (1992) - Santino 
What Happened to Pete (1992) - Bartender 
In the Soup (1992) - Joe 
White Fang (1991) - Skunker 
Diary of a Hit Man (1991) - Koenig 
Cold Heaven (1991) - Tom Farrelly 
Mobsters (1991) - Father Bonotto 
Cold Dog Soup (1990) - Jojo 
Dick Tracy (1990) - Sam Kathcum 
Wicked Stepmother (1989) 
Colors (1988) - Sullivan 
Johnny Be Good (1988) - Wallace Gibson 
Plain Clothes (1988) - Ed Malmburg 
Track 29 (1988) - Dr. Bernard Fairmont 
Best Seller (1987) (uncredited) - Carter 
Survival Game (1987) - Dave Forrest 
Tin Men (1987) - Cheese 
Eye of the Tiger (1986) - Sheriff 
Love Streams (1984) - Jack Lawson 
Double Exposure (1982) - Dr. Frank Curtis 
King of the Mountain (1981) - Barry Tanner 
Mountain Men, The (1980) - La Bont 
California Dreaming (1979) - Duke Slusarski 
Ravagers (1979) - Blind Lawyer 
Sunburn (1979) - Dobbs 
Convoy (1978) - Governor Haskins 
Black Oak Conspiracy (1977) - Homer 
Death Game (1977) - George Manning 
Scott Joplin (1977) - Dr. Jaelki 
Valentino (1977) - George Ullman 
Killing of a Chinese Bookie, The (1976) - Mort Weil (Gangster) 
Last Tycoon, The (1976) - Seal Trainer 
Minnie and Moskowitz (1971) - Seymour Moskowitz 
Revolutionary, The (1970) - Leonard II 
Faces (1968) - Chet 
Coogan's Bluff (1968) - Joe, young hood 
Killers, The (1964) - Desk Clerk 
Pair of Boots, A (1962) 
Webster Boy, The (1962) - Vic 
Too Late Blues (1961) - Red, the bassist 
Juke Box Racket (1960) - Seymour 
Murder, Inc. (1960) (uncredited) - Teenager 

Credit: The Internet Movie Database

Rushmore Criterion Collection DVD

The Royal Tenenbaums

The Faces