I am a geophysicist with a broad background in both deepwater and onshore oil and gas exploration and development. I specialize in integrating geophysical technology with geology and petrophysics to aid in the discovery and efficient development of unconventional reservoirs. Most recently, I have developed and currently manage the geophysical program at EnerVest, Ltd. As Director of Geoscience Technology, I also manage the GIS and petrophysical functions as well as geoscience specialty software/subscriptions at EnerVest. EnerVest is a privately held company that is recognized as one of the largest and most successful managers of oil and gas assets for institutional investors and currently manages diversified assets valued at over $9 billion. The company currently operates more than 28,000 wells in 17 states across the continental United States. EnerVest is also the managing partner for EV Energy Partners (NYSE: EVEP), a publicly traded upstream Master Limited Partnership focused on acquiring and operating oil and gas properties. Specialties: Geophysical prospecting and interpretation, shale and unconventional resource exploration and development, horizontal drilling, seismic attributes, seismic rock properties and inversion, spectral decomposition, microseismic monitoring, seismic visualization, 3D seismic acquisition

Chief Geophysicist, Director Geoscience Technology @ - Initiated a geophysical program at EnerVest in 2011. - Manage geophysical, GIS, and petrophysical functions company wide. - Primary focus areas include the Granite Wash, Eagleford, Austin Chalk, Barnett Shale, Utica Shale, the Uinta Basin, and the San Juan Basin. From August 2011 to Present (4 years 5 months) Houston, Texas AreaDistrict Geophysicist @ Haynesville Shale, Louisiana August 2010 - July 2011 Permian Basin, West Texas April 2007 - August 2010 - Bone Spring and Avalon Shale exploration, Delaware Basin - Wolfcamp mixed lithology turbidite exploration, Delaware Basin - Woodford and Barnett Shale, Delaware Basin From April 2007 to July 2011 (4 years 4 months) Oklahoma City, Oklahoma AreaGeophysicist @ U.S. Onshore Exploration From 2006 to 2007 (1 year) Geophysicist @ Geophysical Technology Gulf of Mexico Deepwater Development From 2003 to 2006 (3 years)

Ph.D., Geophysics @ California Institute of Technology From 1996 to 2003 B.S., Geoscience @ University of Arizona From 1992 to 1996 Bill Keller is skilled in: Seismic Attributes, Directional Drilling, Geophysics, Seismology, Inversion, Geographix, Petroleum Geology, Earth Science, Sequence Stratigraphy, Geology, Petrophysics, Stratigraphy, 3D seismic interpretation, Seismic Imaging, Upstream