Ken Leung was born in New York City and initially raised in the Two Bridges section of the Lower East Side of Manhattan. His family moved to Midwood, Brooklyn where he grew up before finishing high school in Old Bridge , New Jersey.

Leung later attended New York University (NYU) as a University Scholar and discovered acting in his junior year, when he studied acting with Catherine Russell and Nan Smithner, and then briefly with Anne Jackson at HB Studio. During this time he acted mostly in downtown spaces and black box theaters, working with groups such as the Ma-Yi Theater Company, New Perspectives, and STAR, a traveling group of actors-educators based in Mount Sinai Hospital .

In 1997, Leung made his debut in Brett Ratner's Rush Hour . Ratner stated, " Ken's a great actor. In my opinion, he's equivalent to Philip Seymour Hoffman as far as talent is concerned." Edward Norton cast him in his directorial debut Keeping the Faith in 2000. Since then Leung has appeared in several independent and television films, as well as features, including four films with Brett Ratner and two with Spike Lee. In 1998, he played James the Less and God in Terrence McNally's passion play, Corpus Christi , and in 2002 made his Broadway debut in the musical Thoroughly Modern Millie (and appears on the cast recording).

In 2007, he starred in the independent film Shanghai Kiss with Hayden Panettiere, and earned a Special Mention at the San Francisco International Asian American Film Festival for his breakthrough performance. That same year he guest-starred in the final season of the HBO drama series The Sopranos. This memorable guest role inspired the producers of the ABC drama Lost to cast him in a regular role as Miles Straume in the series' fourth season. He remained on the show for the rest of its run.

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! Title !! Role !! Notes
rowspan="2" |1995	''Pictures of Baby Jane Doe''	Shopkeeper		-	''Welcome to the Dollhouse''	Barry		-	rowspan="2" |1997	''Red Corner''	Peng		-	''Kundun''	(voice)		-	rowspan="2" |1998	''Fly (1998 film)|Fly''	Jeremy Kim		-	''Rush Hour (film)|Rush Hour''	Sang		-	rowspan="1" |1999	''Man of the Century''	Mike Ramsey		-	rowspan="3" |2000	''Keeping the Faith''	Don		-	''Maze (film)|Maze''	Dr. Mikao		-	''The Family Man''	Sam Wong the Deli Clerk		-	rowspan="4" |2001	''Artificial Intelligence: A.I.''	Syatyoo-Sama		-	''Home Sweet Hoboken''
''Spy Game''	Li		-	''Vanilla Sky''	Art Editor		-	rowspan="2" |2002	''Face (2002 film)|Face''	Willie		-	''Red Dragon (film)|Red Dragon''	Lloyd Bowman		-	rowspan="3" |2004	''Saw (film)|Saw''	List of Saw characters#Steven Sing|Detective Steven Sing		-	''Strip Search (film)|Strip Search''	Liu Tsung-Yuan	TV Movie
''Sucker Free City''	Lincoln Ma	TV Movie
rowspan="2" |2005	''Hate (film)|Hate''	Mo	TV Movie
''The Squid and the Whale''	School Therapist		-	rowspan="2" |2006	''Inside Man''	Wing		-the sapranos	''X-Men: The Last Stand''	Quill (comics)|Kid Omega		-	rowspan="3" |2007	''Year of the Fish''	Johnny		-	''Shanghai Kiss''	Liam Liu	Received a Special Mention at the San Francisco International Asian American Film Festival for his breakthrough performance.
''Falling for Grace''	Ming		-	2009	''Saw V''	List of Saw characters#Steven Sing|Detective Steven Sing	Cameo
2009	''Works of Art''	John Kim

Television

! Title !! Role !! Notes
1995 2000 2002	''Law & Order''	Chung; Tommy Wong; Stephen Wong
1997	''New York Undercover''	David Kwan	Episode:''' Vendetta
2000	Wonderland''		'''Episode:''' Spell Check
	Deadline''	Fung	Episode:''' Pilot
2001	Oz''	Bian Yixue	Episode:''' Conversions
2004	The Jury''	Ken Arata	Episode:''' Memories
	''Whoopi''	Terrence	'''Episode:''' Identity Crisis
2007	''The Sopranos''	List_of_characters_from_The_Sopranos_-_Friends_and_Family#Carter_Chong>Carter Chong	Episode:''' Remember When (The Sopranos)>Remember When
2008???2010	Lost''	Miles Straume	Series Regular; 45 episodes

• Ken Leung at Lostpedia

Interviews

• Asia Pacific Arts - UCLA Asia Institute , May 30, 2008

• Hillis, Aaron. Ken Leung on 'Year of the Fish'" , IFC.com, August 27, 2008