
Acting
Gervase Duan Spradlin (August 31, 1920 – July 24, 2011) was an American actor. Known for his distinctive accent and voice, he often played devious authority figures.
Description above from the Wikipedia article G. D. Spradlin, licensed under CC-BY-SA, full list of contributors on Wikipedia.

The Godfather: The Complete Epic 1901–1959
as Sen. Patrick Geary

Dick
as Ben Bradlee

The Long Kiss Goodnight
as President

Riders of the Purple Sage
as Pastor Dyer

Dark Skies
as Elliot P. Grantham / Patient Zero

Nick of Time
as Mystery Man

Canadian Bacon
as R.J. Hacker

Ed Wood
as Reverend Lemon

Clifford
as Parker Davis

Telling Secrets
as Walter Jefferson

Dark Skies
1 ep.

Intruders
as General Hanley · 2 ep.

Cruel Doubt
as George Bates · 2 ep.

War and Remembrance
as Raymond A. Spruance · 1 ep.
Nutcracker: Money, Madness & Murder
as Franklin Bradshaw · 3 ep.

The Greatest American Hero
1 ep.

Mario Puzo's The Godfather: The Complete Novel for Television
as Sen. Patrick Geary · 4 ep.

Rich Man, Poor Man - Book II
as Sen. Dillon · 5 ep.

City of Angels
4 ep.

Search
1 ep.
The Long Kiss Goodnight
1996