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Acting
Daniel Davis (born November 26, 1945) is an American stage, screen, and television actor best known for portraying Niles the butler on the popular sitcom The Nanny, and for his two guest appearances as Professor Moriarty on Star Trek: The Next Generation, affecting an upper class English accent for both roles. He also voices the intelligent Cro Magnon, Longhair from the Longhair and Doubledome cartoon shorts from Cartoon Network's Big Pick.

Elsbeth
as Dr. Yablonski

Stars in the House
as Self

Star Trek: Picard
as Professor James Moriarty

New Amsterdam
as Vic Wallace

The Good Fight
as Professor Harrison

Gotham
as Jacob Skolimski

The Blacklist
as Baldur Magnusson

Elementary
as Antoine LaGrange

The Fran Drescher Show

The Prestige
as Judge

Ugly Betty
as Dr. Morgan Remus

The Nanny Reunion: A Nosh to Remember

Longhair and Doubledome: Good Wheel Hunting
as Longhair (voice)

The Practice
as Judge Barton Wolfe

Remember WENN
as Desmond Quist

The Nanny: Oy to the World
as Niles (voice)

Chicago Hope
as Gambler #2

Duckman
as Rodney (voice)

The Nanny
as Niles

Frasier
as Dr. Shafer

Palomino
as Doctor

The Perfect Tribute
as Gov. Curtin

Havana
as Marion Chigwell

The Hunt for Red October
as CPT Charlie Davenport (USS Enterprise)

K-9
as Halstead

Star Trek: The Next Generation
as Professor James Moriarty

Frank's Place
as Arnold David Tuney

The Spirit
as Teasdale

Davy Crockett
as Congressman

George Washington II: The Forging of a Nation
as Patrick Henry

L.A. Law
as C. Howard Grady

Matlock
as James Billings

MacGyver
as Nicholas Helman

Tall Tales & Legends
as Congressman

The Equalizer
as Eddie Mason

Chain Letters
as Steve
The Eagle and The Bear
as Underhill

Murder, She Wrote
as Neal Dishman

Highway to Heaven

Scarecrow and Mrs. King

The A-Team
as Phillips

Remington Steele
as Pierre Fumar

Cheers
as Mr. Reinhardt

Cagney & Lacey

Dynasty

Texas
as Eliot Carrington

In Fashion
as Moulineaux

Columbo
as Alex Varrick

Great Performances
as Moulineaux