You are the company you keep
CHRIS HAMMACK
FOUNDER AND CO-CEO
Chris is co-CEO of Presidio, a position he has held since co-founding the company in 2017. He has over 20 years of energy experience, most recently as CEO of Trinity River Energy, a $1 billion+ exploration and production company, backed by KKR and Riverstone.
With a focus on operational efficiency and cost-cutting, Chris has successfully led and managed several portfolio companies for private equity investors including EnCap Investments, Riverstone Holdings, and KKR.
He graduated from Texas A&M with a degree in Petroleum Engineering.
WILL ULRICH
FOUNDER AND CO-CEO
Will is co-CEO of Presidio, a position he has held since co-founding the company in 2017. His mission is to create the industry's best return on capital employed by delivering the industry's lowest operating expenses and highest profitability.
Will has over 15 years of energy experience and is focused on using technology and best practices to drive behavior change in the oilpatch. Prior to co-founding Presidio, he was Head of Corporate Development and Strategic Planning for Atlas Energy, a family of public and private upstream and midstream companies. Will helped grow the Atlas family of companies to an enterprise value of nearly $10 billion, generating close to $1 billion of EBITDA and monetizing that value through a series of successful asset and public company exits.
He graduated from Harvard College with a degree in Economics and began his career as an investment banker at UBS.
BRETT BARNES
GENERAL COUNSEL & VICE PRESIDENT LAND
Brett is responsible for Presidio’s legal, land and regulatory functions. He has over 13 years of energy experience, most recently as Vice President – Land and HSE/Regulatory for Trinity River Energy.
Over the course of his career, Brett has served as in-house legal counsel and led land, land administration, health, safety, environmental and regulatory functions.
He graduated from The University of Texas School of Law with a Juris Doctor and from Texas A&M University with a degree in Finance.
DANIEL BRAXTON
VICE PRESIDENT, EFFICIENCY
Daniel joined Presidio in September 2018 to provide engineering expertise and oversight on asset evaluations and field operations. Previously, he spent 10 years with Jones Energy focusing on assets in the Western Anadarko Basin and worked with ConocoPhillips in the San Juan Basin.
He has supported drilling, completion, and production operations in various capacities and has spent much of his career focused on A&D and business development.
He holds a B.S. degree in Petroleum Engineering and a M.B.A. from the University of Texas at Austin.
JEFF DANIELS
VICE PRESIDENT, GROWTH VENTURES
Jeff joined Presidio in June 2018 and is responsible for leading all aspects of Presidio’s geological and geophysical evaluations. He has over 24 years of industry operational and development experience, at three mid-scale and large U.S. independent oil and gas companies, including 17+ years at XTO Energy.
Jeff has compiled an extensive conventional and unconventional work history across 9 domestic and international basins, and progressed from front-end field geological evaluation to various leadership, mentor, and executive-management ranks.
He graduated from the University of Texas at Arlington with a bachelor’s and master’s degree in Geology.
GINNIE VIERRA
VICE PRESIDENT, FINANCE & ACCOUNTING
Ginnie joined the Presidio team as the Controller in June 2018 with 7 years of energy accounting experience. Prior to joining Presidio, she began her energy career with Silver Oak Energy, LLC, then most recently as the Controller for Broad Oak Energy II, LLC, both funded by Encap Investments LP.
She graduated from Texas Tech University with a BA in Accounting and The University of Texas at Arlington with a MSA in Accounting.
DAVID MOCHULSKI
VICE PRESIDENT, RESERVOIR & TECHNOLOGY
David comes to Presidio with over 12 years of experience within the reservoir engineering discipline, most recently at ExxonMobil and XTO. He has advanced fluency in scientific programming and has expertise in numerous programming languages. He heads Presidio’s Reservoir and Technology group, where he is responsible for the development and integration of optimized workflows and software to improve company agility.
Over his career, he has worked waterfloods/gasfloods, unconventional gas, unconventional oil, conventional/tight gas, steam floods, and high-pressure steam injection. His experience spans the full field lifecycle including drilling/development, workover identification, production optimization, operations, and facility debottlenecking.
He holds a B.S. in Chemical Engineering, specializing in process control from the University of Alberta and a MASc. in Chemical and Biological Engineering from the University of British Columbia.
COLBY TIFFEE
VICE PRESIDENT, COMMERICAL OPTIMIZATION
Colby joined Presidio in January 2020 and is responsibile for maximizing netbacks across Presidio’s portfolio of oil, gas, NGLs and water. He has over 20 years of upstream and midstream marketing experience and was previously Director of Commercial Development for Alta Mesa Resources and LINN Energy.
He graduated from the University of Oklahoma with a Bachelor of Business Administration degree in Energy Management with a minor in Finance.