Our Team

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You are the company you keep

CHRIS HAMMACK   FOUNDER AND CO-CEO   LinkedIn   Chris 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.

CHRIS HAMMACK

FOUNDER AND CO-CEO

LinkedIn

Chris 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

LinkedIn

Will has over 13 years of energy experience. 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.

Over the course of his career, he has encountered all types of energy transactions, ranging from small land acquisitions to multi-billion dollar public mergers. He has directly done more than $20 billion of energy mergers, acquisitions, divestitures and joint ventures.

He graduated from Harvard College with a degree in Economics.

BRETT BARNES   GENERAL COUNSEL & VICE PRESIDENT LAND   LinkedIn   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.

BRETT BARNES

GENERAL COUNSEL & VICE PRESIDENT LAND

LinkedIn

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.

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.

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.

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.

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.

DUSTIN HAYS   LAND ADMINISTRATION MANAGER  Dustin has over 14 years of energy experience, most recently as Land Administration Manager at TOTAL - TEP Barnett USA.  Over the course of his career, Dustin has successfully led and managed the Land Administration teams for multiple large companies.  He graduated from The University of Texas at Arlington with a degree in Business Management.

DUSTIN HAYS

LAND ADMINISTRATION MANAGER

Dustin has over 14 years of energy experience, most recently as Land Administration Manager at TOTAL - TEP Barnett USA.

Over the course of his career, Dustin has successfully led and managed the Land Administration teams for multiple large companies.

He graduated from The University of Texas at Arlington with a degree in Business Management.

AMBER HANDY   ENGINEERING TECHNICIAN  Amber has 15 years of energy experience, currently an Engineer Tech for Presidio Petroleum.  She started her career in the field as a pumper, and over the last 13 years has been an Engineering/Production Tech supporting the engineering group, and daily field operations.

AMBER HANDY

ENGINEERING TECHNICIAN

Amber has 15 years of energy experience, currently an Engineer Tech for Presidio Petroleum.

She started her career in the field as a pumper, and over the last 13 years has been an Engineering/Production Tech supporting the engineering group, and daily field operations.