Philip L. Casnoff was born on August 3, 1949, in Philadelphia, Pennsylvania. He attended and graduated in the 226th Class from Central High School in Philadelphia, Pennsylvania in 1967. [5] Casnoff attended and graduated in 1971 from Wesleyan University, a private liberal arts college located in Middletown, Connecticut.
| Year | Title | Role | Notes | | 1984 | The Edge of Night | Brian Murdock | television debut |
| 1990 | One Life to Live | Rob Riviera |
| 1982 | American Playhouse | unknown | Episode: "King of America" |
| The Renegades | Dancer | Television Movie |
| Remington Steele | Ben Pearson | Episode: "License to Steele" credited as Philip Sanoff |
| 1983 | The Hamptons | David Landau | Episode: "#1.1" |
| 1984 | George Washington | Lafayette | Television Miniseries Episode "#1.1" |
| ABC Afterschool Special | Harvey Schmidt | Episode: "Out of Step" |
| Tales from the Darkside | Chris Wood | Episode: "Slippage" |
| 1985 | Crazy Like a Fox | Gino | Episode: "Bum Tip" |
| 1985-1985 | North and South: Book I | Major Elkanah Bent | Television Miniseries 4 episodes |
| 1986-1986 | North and South: Book II |
| 1987 | Hands of a Stranger | Marty Loftus | Television Movie |
| 1988 | The Red Spider | Detective Patrick Shaunessy | Television Movie |
| 1991 | Ironclads | Lieutenant Guilford | Television Movie |
| Red Wind | Charlie Lapidus | Television Movie |
| 1992-1992 | Sinatra | Frank Sinatra | Television Miniseries; 4 episodes
Nominated - American Television Award for Best Actor in a Miniseries
Nominated - Golden Globe Award for Best Lead Actor in a Miniseries or Motion Picture Made for Television |
| 1994-1994 | North and South: Book III | Elkanah Bent | Television Miniseries; 3 episodes |
| 1994-1995 | Under Suspicion | Internal Affairs Detective James Vitelli | series regular; 18 episodes |
| 1995 | Sisters | Jack Chambers | 3 episodes |
| Zoya | Simon Hirsch | Television Movie |
| Chicago Hope | Paul Accosta | Episode: "Christmas Truce" |
| 1996 | Special Report: Journey to Mars | Nick Van Pelt | Television Movie |
| The Nanny | Cantor Gary Isaacs | Episode: "The Cantor Show" performer: "Bayom Hahu", "Change My Mind" |
| Wings | Eric | Episode: "Too Beautiful for You" |
| Promise Land | Bill Carter | Episode: "Little Girl Lost" |
| 1997 | Little Girls in Pretty Boxes | Greg Radkin | Television Movie |
| The Hunger | William Cobb | Episode: "Necros" |
| 1998 | Blood in Her Hands | Richard Davis | Television Movie |
| Players | John Fellowes | Episode: "Con-spiracy" |
| Tempting Fate | Richard Davis | Television Movie |
| Chameleon | Cortez, IBI Chief | Television Movie |
| The Defenders: Taking the First | John Walker | Television Movie |
| ER | Dr. Dan Litvak | Episode: "Masquerade" |
| 1999 | Fantasy Island | unknown | Episode: "Innocent" |
| The Practice | Danny Rogers | Episode: "Of Human Bondage" |
| Walker, Texas Ranger | Harris | Episode: "Livegirls.now" |
| Diagnosis Murder | Grant Connor | Episode: The Seven Deadly Sins" |
| 1999-2000 | Oz | Nikolai Stanislofsky | recurring role; 13 episodes |
| 2000 | Chicken Soup for the Soul | unknown | Episode: "14 Steps/Damaged Goods/Ballerina Dreams" |
| Kiss Tomorrow Goodbye | Mackey, Dusin's Boss | Television Movie |
| For All Time | Al Glasser | Television Movie |
| 2000-2005 | Strong Medicine | Chief of Staff Dr. Robert Jackson | recurring role; 108 episodes Director; 8 episodes |
| 2001 | Special Victims Unit | Ilya Korska | Episode: "Pixies" |
| 2002 | A Line in the Sand | Jack Santon | Television Movie |
| Frasier | Dr. Bernard Gadston | Episode: "War of the Words" |
| Law & Order | Bill Talbot | Episode: "Slaughter" |
| 2005 | Trial by Jury | Assistant District Attorney Nick Forster | Episode: "The Line" |
| 2005-2006 | Monk | {{n/a}} | Director; 2 episodes |
| 2006 | Without a Trace | Donald Clarence | Episode: "Candy" |
| Numb3rs | Maurice Connors | Episode: "Longshot" |
| 2007 | Crossing Jordan | Dr. Sanchez | Episode: "Sleeping Beauty" |
| 2008 | Jane Doe: Eye of the Beholder | Lance Saxon | Television Movie |
| 2009-2010 | Dollhouse | Clive Ambrose | 3 episodes |
| 2010 | Criminal Minds | James Stanworth | Episode: "25 to Life" |
| 2011 | LA | Bo | Episode "Zuma Canyon" |
| Field of Vision | Kenny McFarland | Television Movie |
| The Whole Truth | unknown | Episode: "The End" |
| 2011-2012 | NCIS | Sean Latham | 2 episodes |
| 2012 | Crime Scene Investigation | Jonah Clyborn | Episode: "Seeing Red" |
| Franklin & Bash | Gleen Friedman | Episode: "Viper" |
| Grey's Anatomy | Dr. Mel Barnett | Episode: "Going, Going, Gone" |
| 2013 | Lucky 7 | Charlie | 2 episodes |
| 2014 | Perception | Gordon Williams | Episode: "Obsession" |
| 2015 | Scream Queens | Steven Munsch | Episode: "Beware of Young Girls" |
| 2016 | Elementary | Jack McGill | Episode: "To Catch a Predator Predator" |
| 2017 | Homeland | Christopher | Episode: "America First" |
| Chicago P.D. | Mr. Dowd | Episode: "Grassing for Salvation" |
| One Mississippi | Ezra Weiss | Web Series; 2 episodes |
| 2018 | Madam Secretary (TV series) | Judge Nathan Mayfield | Episode:"Family Separation: Part 1" |
| Year | Title | Role | Notes | | 1972–1980 | Grease | Teen Angel (replacement) | Royal Theatre 20 performances |
| 1976 | Rockabye Hamlet | Hamlet / Laeres (standby) | Minskoff Theatre 7 performances |
| 1988 | Chess | Frederick "Freddie" Trumper, The American | musical; Broadway - Imperial Theatre 68 performances
Theatre World Award for Best Actor |
| 1988–1989 | The Devil's Disciple | unknown role (replaced Richard Dudgeon) | Circle in the Square Theatre |
| 1990 | Shogun: The Musical | John Blackthorne | musical; Broadway - Marquis Theatre 72 performances |
| 1996–present | Chicago | Billy Flynn (replacement) | Richard Rodgers Theatre |
1. ^{{cite web |last=Lipton |first=Michael A. |url=http://www.people.com/people/archive/article/0,,20109048,00.html |title=Ring-a-Ding Ringer |publisher=People.com |date=1992-11-09 |accessdate=2010-10-18}}
2. ^{{cite web |url=http://www.nbrmp.org/features/Summer2008FoxMGM.cfm |title=Summer 2008: Fox/MGM |publisher=Nbrmp.org |date= |accessdate=2010-10-18}}
3. ^{{cite web |url=http://www.nndb.com/people/669/000132273/ |title=Philip Casnoff |publisher=Nndb.com |date= |accessdate=2010-10-18}}
4. ^{{cite web |url=http://www.filmreference.com/film/72/Philip-Casnoff.html |title=Philip Casnoff Biography (1955-) |publisher=Filmreference.com |date=1955-08-03 |accessdate=2010-10-18}}
5. ^{{Cite web|url=https://centralhs.philasd.org/about-us-2/famous-alumni/|title=Notable Alumni – Central High School|website=centralhs.philasd.org|language=en-US|access-date=2018-05-08}}