David Seltz was named executive director of the new state Health Policy Commission Tuesday, charged with implementing much of the massive health care cost control bill signed by Governor Deval Patrick in August. Seltz, 31, has been a special advisor to Patrick on health cost containment since August and previously worked nine years in the Legislature.

He was a health care analyst for Senator Therese Murray when she was on the conference committee that wrote the final language of the 2006 health care law requiring most Massachusetts residents to have health insurance.