MyNetworkTV and Twentieth Television unveiled two advertising sales executive appointments Tuesday. Dave Barrington has been promoted to the new position of senior VP and general sales manager of advertising sales for MyNetworkTV. In addition, Elizabeth Herbst-Brady will join MyTV sister company Twentieth Television as senior VP of advertising sales, replacing Mr. Barrington.

Both Mr. Barrington and Ms. Herbst-Brady will report directly to Bob Cesa, the New York-based executive VP of advertising sales for Twentieth Television, who made the announcement.

Effective immediately, Mr. Barrington will be responsible for overseeing ad sales for MyNetworkTV, which is scheduled to launch with Sept. 5 with a schedule of Monday-to-Friday limited drama series. Most recently he was senior VP of ad sales for Twentieth.

Ms. Herbst-Brady will manage first-run and off-net syndication ad sales on behalf of the company, effective Sept. 5. She joins Twentieth Television from Starcom USA in Chicago, where she was senior VP and director of broadcast investment. She joined Starcom in 2004 from Universal Television, where she served as executive VP of advertising sales in New York. Ms. Herbst-Brady previously worked for Twentieth Television from 1993 to 1996. She also worked in sales at Tribune Entertainment, Action Media and CBS Network Sales, where she began her career.

Mr. Barrington joined Twentieth Television as an account executive in 1994 and was promoted to VP of ad sales in 1998. In 2003 he was named senior VP of ad sales, with an added involvement in the company’s sales activities for satellite service DirectTV. Throughout his tenure with the company he has been involved with barter sales for first-run shows “Divorce Court” and “Judge Alex,” as well as the off-net programs “24,” “The Bernie Mac Show,” “Cops,” “King of the Hill,” “Malcolm in the Middle,” the company’s “Century 19” feature film package and select programs distributed by Carsey-Werner. Before joining Twentieth Television, he was VP and manager of national broadcast for Grey Advertising (now MediaCom). He began his career as a media planner and buyer for Halladay Advertising.