AUSTIN, Texas, Dec.

HOUSTON, June 9, 2011 /PRNewswire/ -- Bruce Vincent, president and director of Swift Energy Company and chairman of the Independent Petroleum Association of America (IPAA), will be the opening keynote speaker at Hart Energy's 2(nd) annual Developing Unconventional Gas (DUG((TM))) Eagle Ford conference & exhibition, October 10-12, at the Henry B.