- Radio: Often guest-starred on the drama series "Nightbeat," which starred Frank Lovejoy.
- (1952-53) Radio: Appeared (as "Helen Asher") on CBS Radio's "Richard Diamond, Private Detective".
- (1949-54) Radio: Appeared (as "Claire 'Brooksie' Brooks" on Mutual Radio's "Let George Do It". NOTE: She was the second actress to play that role.
- (1958-60) Radio: Appeared (as "Miss Wong") on the CBS Radio western series "Have Gun Will Travel".
- (1952-61) Radio: Many guest-starring roles on "Gunsmoke" on CBS Radio.
- (1949-52) Radio: Appeared (as "Helen Asher") on NBC's "Richard Diamond, Private Detective".
- (1930's-1960's) Gregg was a prolific radio actress, heard on such programs as The Adventures of Sam Spade, Dragnet, Dr. Kildare, Gunsmoke, The Jack Benny Program, Let George Do It, Lux Radio Theatre, One Man's Family, Yours Truly, Johnny Dollar, The Screen Guild Theater, The CBS Radio Mystery Theatre, The Zero Hour and Mutual Radio Theater.
- (1950-60) Radio: Many guest-starring roles on "Yours Truly, Johnny Dollar" on CBS Radio.
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