Actor Ray Liotta, who recently co-starred as Frank Sinatra in HBO’s “The Rat Pack,” has signed with Endeavor.

Liotta recently wrapped Paul Schrader’s latest, “Forever Mine,” with Gretchen Mol and Joseph Fiennes. His other credits include “Copland,” “Field of Dreams” and “GoodFellas.”

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Thesp Robert Wuhl has signed with the Paradigm Agency. Wuhl created the HBO comedy series “Arli$$” in 1996 and currently serves as star and exec producer. The actor — seen in films such as “Batman,” “Bull Durham” and “Good Morning, Vietnam” — ankled William Morris although the agency will continue to handle Wuhl’s personal appearances.

Wuhl is managed by Howard West of Shapiro/West and Associates.

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United Talent Agency recently signed director Greg Mottola (“The Daytrippers”) and his producing partner Nancy Tenenbaum. The duo are developing the feature “Date School” as a starring vehicle for Ben Stiller and Cameron Diaz for DreamWorks.

Director Ben Ross (“The Young Poisoner’s Handbook”), who recently helmed “RKO 281” for HBO, also has signed with UTA. Ross continues to be repped in London by William Morris.

On the TV side, UTA has signed scribe Jeffrey Richman (“Frasier,” “Stark Raving Mad”), writer-producer Michael Curtis (“Friends,” “Work With Me”) and writer Paul Guyot (“Felicity,” “Snoops”). “Becker” co-producer Matthew Weiner also recently signed with the firm.

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Writer Sean O’Byrne, who co-wrote, with David E. Kelley, the upcoming feature “Mystery, Alaska,” has signed with the Gersh Agency. O’Byrne previously served as a staff writer on the CBS series “Picket Fences.”

Director Scott Ziehl, whose feature debut “Broken Vessels” won the best feature film award at the 1998 Los Angeles Independent Film Festival, also has signed with Gersh. Ziehl currently is developing “Airtime” for Miramax.

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Director Po Chih Leong, who most recently helmed the upcoming Miramax release “The Wisdom of Crocodiles,” has signed with the Broder, Kurland, Webb, Uffner Agency, where he will be repped by Paul Alan Smith and Jim Rosen.

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IFA Talent Agency recently upped assistant Joe Vance to talent agent. Vance joined IFA in 1997 as an assistant to partner Wendy Murphey.