Veteran HBO exec Richard Waltzer is exiting his post as executive VP of HBO Pictures. He is expected to ankle the pay cabler in the next few weeks.Waltzer has been with the premium cable web for 12 years and has worked closely with former HBO Pictures top-per Bob Cooper, who left in July to become president of TriStar Pictures and was replaced by former Fox Enter-tainment Group president John Matoian. “I’m immensely grateful to Richard for helping me these past few months with my transition to HBO,” Matoian said. With the arrival of Matoian, Waltzer found many of his duties clashing with those of his new boss. HBO films Waltzer was associated with include “And the Band Played On,” “Indictment,” “Citizen Cohn,” “The McMartin Trial” and “Gotti.” “I leave with an enormous sense of pride in having been a part of such a wide range of high-quality movies. In eve-ryone’s career there is a moment to move to the next chapter and this is the right time for me,” Waltzer said in a statement. HBO chairman and CEO Jeff Bewkes said Waltzer has been an integral part of the cable web’s success over the past 12 years. During his tenure at HBO, Waltzer oversaw production on more than 30 films that cleaned up at the Emmy awards as well as Golden Globe and CableAce awards. Waltzer joined HBO in 1985 as a story analyst. Posts he subsequently held include director, vice president and senior vice president. Before HBO, he worked with directors Peter Bogdanovich and Orson Welles.