About Us

Chaparral Energy

At Chaparral we are never satisfied with the status quo. Our story is one that embodies innovation, resourcefulness, creativity, financial responsibility and loyalty to the communities in which we operate.

Our core operations stretch across Oklahoma and are located primarily across Canadian, Kingfisher, and Garfield counties. Fueled by our highly talented employees, we have grown from our humble beginnings to become a premier Mid-Continent operator. While energy companies are nothing new in Oklahoma, Chaparral continues to set ourselves apart through our entrepreneurial spirit and dedication to continuous improvement.

Leadership

Leadership Philosophy

Our guiding philosophy is essential and runs deep — do right by our employees, shareholders, owners and local communities, and in turn, their support will fuel our mutual success. This approach began with our founding and has always been the foundation of our company’s culture, values and strategies. Today our leadership team’s extensive knowledge and experience combine to guide Chaparral’s long-term success.

Charles (Chuck) Duginski

Chief Executive Officer

Charles “Chuck” Duginski joined Chaparral in 2019 as President and Chief Executive Officer.  

Mr. Duginski most recently served as Chief Operating Officer, Senior Vice President, and board member of Tapstone Energy, LLC.  Prior to joining Tapstone, Mr. Duginski served as Chief Operating Officer of Echo Energy.  He also served as Vice President – Southern Region Production of Continental Resources, Inc., where he had operational and technical responsibility for the Anadarko Basin.  Before Continental, Mr. Duginski held various positions of increasing responsibility at Chesapeake Energy Corporation, including District Manager – Haynesville, then Vice President – Haynesville/Barnett Business Unit.  Mr. Duginski began his career in technical roles at Mobil Oil and ExxonMobil and holds a Bachelor of Science in Mechanical Engineering from the University of Oklahoma.

Justin Byrne

Senior Vice President, General Counsel and Secretary

Justin Byrne joined Chaparral in 2019 as vice president, general counsel and secretary. Prior to joining the company, Mr. Byrne worked in the private law practice of Hall, Estill, Hardwick, Gable, Golden and Nelson, P.C. 

From 2008 to 2016, Mr. Byrne worked at SandRidge Energy, where he served as associate general counsel and assistant corporate secretary. Before that time, he was counsel at Devon Energy and Kerr-McGee Corporation after beginning his career with the firm of Hughes & Luce, L.L.P. 

Mr. Byrne holds a Doctor of Jurisprudence from the University of Texas School of Law and a Bachelor of Arts degree in history from the University of Tulsa. He is a member of both the Oklahoma and Texas State Bars and has served on a number of charitable boards.

Clint Calhoun

Vice President - Resource Development

Clint Calhoun joined Chaparral in 2019 as vice president of resource development. Before joining the company, Mr. Calhoun co-founded the Merge- and SCOOP-focused Travis Peak Resources in 2013, where he served as Vice President of Engineering and was responsible for providing assessment and development strategy, budgeting and management of day-to-day operations for its Appalachia and Mid-Continent assets. Prior to that time, Mr. Calhoun worked for Newfield Exploration Company in a number of positions of increasing importance, including as a production and reservoir engineer, as well as an asset lead and asset manager of its active Mid-Continent resource plays.

Mr. Calhoun holds a Bachelor of Science degree in petroleum engineering from the University of Texas at Austin.

 

Stephanie Carnes

Vice President, Corporate Controller

Stephanie Carnes joined Chaparral in 2012 and has held various leadership roles, including internal and external reporting, corporate, operations and tax accounting, as well as assistant controller and financial reporting director before being named as a vice president and corporate controller.

Prior to joining Chaparral, Ms. Carnes held various financial and regulatory reporting, international finance and operations positions with increasing responsibility working for large organizations, such as SERVA Group, L Brands, Ernst & Young and PricewaterhouseCoopers. Ms. Carnes has more than 17 years of experience in areas including financial reporting, business planning and development, organizational design and restructuring, team development and leadership, and strategic planning.

Ms. Carnes holds Bachelor and Master of Accounting degrees from Oklahoma State University. 

Josh Walker

Vice President - Completions & Operations

Josh Walker joined Chaparral in 2018 as vice president of completions and operations.  

Before joining Chaparral, Mr. Walker served as the innovation manager at Chesapeake Energy, where he assembled and led a team focused on operations research and development, new and emerging technologies and data analytics. While at Chesapeake, Mr. Walker also served as the completions manager for the company’s Mid-Continent, Eagle Ford, Utica and Marcellus plays, as well as in various other operational roles.  

Prior to that time, Mr. Walker worked for Legend Natural Gas as a drilling, completions and production engineer and Anadarko Petroleum where he held a number of operations positions of increasing importance. 

Mr. Walker holds a Bachelor of Science degree in petroleum engineering from the University of Oklahoma and an Executive MBA in energy from the University of Oklahoma’s Price College of Business.  

Patrick Graham

Vice President – Finance

Patrick Graham joined Chaparral in 2012 as the manager of corporate planning and has held various leadership roles throughout the organization, including director of corporate development, director of corporate finance and most recently serving as the senior director of corporate finance and investor relations prior to being named as vice president of finance.

Mr. Graham began his career at Williams and Level 3 where he held various positions of increasing responsibility prior to leaving as a senior financial analyst to pursue a career in investment banking.  He spent several years in investment banking, both overseas and in Oklahoma prior to joining Chaparral.  In 2016-2017 he served as the director of corporate finance at Ascent Resources prior to re-joining Chaparral.

Mr. Graham holds a Bachelors of Business Administration in Finance and MIS from the University of Oklahoma and a Masters of Business Administration from Oklahoma State University.

Craig Kelleher

Director

Craig Kelleher is the co-founder of Millstreet Capital Management LLC. Prior to co-founding Millstreet Capital, in 2007 Mr. Kelleher co-founded Prelude Asset Management LLC, a spinoff of Partners HealthCare System, Inc., which was established to manage long only and long/short assets on behalf of institutional clients. Prelude with approximately $1.3 billion of assets under management was sold to Congress Asset Management in early 2010, at which time Mr. Kelleher spun off the remaining Prelude infrastructure into what is now Millstreet Capital. Prior to Prelude, Mr. Kelleher worked at Regiment Capital Advisors, a Harvard Management Company spinoff, and he was responsible for the identification, selection, and monitoring of portfolio positions including longs and shorts, credit hedge trades, credit default swaps, collateralized loan obligations, and direct lending strategies within the various Regiment funds. Prior to joining Regiment Capital, Mr. Kelleher worked at Morgan Stanley in the leveraged finance area. Mr. Kelleher currently serves on the Board of Directors of ETX Energy, Knight Energy, and US Shale Solutions. 

Mr. Kelleher has been a CFA Charter Holder since 2006 and he graduated with Honors and Phi Beta Kappa from the University of Chicago with a bachelor’s degree in Public Policy and a specialization in Economics in 1999. 

 

Brian Connolly

Director

Brian Connolly is the co-founder of Millstreet Capital Management LLC. Prior to co-founding Millstreet Capital, Brian worked at Regiment Capital Advisors where he managed sector portfolios within the various Regiment Funds that included core long and short positions, credit hedge trades, credit default swaps, collateralized loan obligations, and direct lending strategies. He also represented Regiment on several steering committees where he played an active role in distressed investments. Prior to joining Regiment Capital, Mr. Connolly worked as a High Yield Research Analyst at Fidelity Investments, a firm he joined upon graduation from business school. At Fidelity Investments, Mr. Connolly was part of the High Yield group during the launches of Fidelity’s bank loan and leveraged company stock funds. Prior to business school, Mr. Connolly worked in the healthcare group for investment bank Alex. Brown & Sons and at the private equity firm Madison Dearborn Partners. Currently, Mr. Connolly serves on the Board of Directors of Aware, Inc. (NASDAQ Ticker AWRE) as well as Fuse Media.

Mr. Connolly graduated from Harvard University with an A.B. in American History in 1992 and received a Master of Business Administration from the Massachusetts Institute of Technology Sloan School of Management in 2000.

Jason Hammerman

Director

Jason Hammerman is a Senior Vice President at Avenue Capital Management II, LP., where he is responsible for identifying and analyzing investment opportunities for the Avenue U.S. Strategy. Since joining Avenue in 2008, Mr. Hammerman has been researching and investing in the oil and gas industry, with an emphasis on companies requiring financial and operational turnaround. Prior to joining Avenue, Mr. Hammerman was an investment banking analyst at Jefferies Group where his responsibilities included restructuring advisory, leverage finance, and mergers and acquisitions. Mr. Hammerman has previously served on the boards of Jones Energy, Inc., a Texas based oil and gas company, and Connacher Oil & Gas, a Canadian oil and gas company.

Mr. Hammerman holds a B.S. in Finance and Accounting from New York University Stern School of Business, where he graduated with Beta Gamma Sigma distinction.

Samuel Barker

Director

Samuel Barker is a Portfolio Manager and CFA Charter Holder at Amzak Capital Management. He assists with the management, tracking, and deployment of Amzak’s fixed-income portfolio. Mr. Barker has previously worked for ECM Asset Management, a Wells Fargo subsidiary specialized in fixed-income investment management. Prior to this, Mr. Barker worked with GE, across a number of regions (US, UK, Sweden and Australia), and in a number of roles, including GE’s internal audit group (CAS).

Mr. Barker holds a Bachelor’s in Information Systems, and a Bachelor’s in Psychology, from The University of Melbourne, Australia.

Mark Castiglione

Director

Mark Castiglione is a partner at Meridian Energy LLC, a Houston-based energy advisory firm established in 2017. He is the former Chief Executive Officer of Alta Mesa Resources, Inc. Mr. Castiglione joined Alta Mesa in January 2019 as a member of the executive team and was promoted to Chief Executive Officer in September 2019. Previously, he was engaged as Senior Advisor to SandRidge Energy, Inc. in 2015 and 2016. Prior to that point, Mr. Castiglione served as Senior Vice President – Business Development of Quantum Resources Management, LLC and QR Energy, LP from 2010 to 2014. Before joining Quantum Resources, he held the position of Vice President – Acquisitions of El Paso Corporation. Mr. Castiglione’s prior background at Encana Corporation, Burlington Resources and Simmons & Company International includes positions of increasing responsibility in corporate development, corporate finance, asset management and engineering. He began his career in 1994 as a reservoir engineer at Burlington Resources.

Mr. Castiglione received a Bachelor of Science degree in petroleum engineering from Texas Tech University and a Master of Business Administration degree from the Cox School of Business at Southern Methodist University.

James S. Addison

Director

James (Jim) S. Addison has more than 34 years of experience in the oil and gas industry and currently serves as the Chief Executive Officer of Hawkwood Energy LLC. He started his career with Amoco Production Company in 1986. Following Amoco, he spent several years with Mitchell Energy and Coastal Oil & Gas Corp. Mr. Addison joined Newfield Exploration Company in 2000. Over his 13-year career at Newfield, he worked in all three domestic business units (Houston, Tulsa and Denver) and served in a variety of technical and leadership roles including General Manager for the MidContinent and Rockies Business Units. Mr. Addison left Newfield in 2013 and established Travis Peak Resources, LLC where he served as President and Chief Executive Officer from November 2013 until its combination with Paloma Partners LLC in February 2019. Currently, Mr. Addison serves on the Board of Directors of Chisholm Energy Holdings, LLC. He also previously served as an independent director and Chairman of Jones Energy II from May 2019 until its merger with Revolution Resources in January 2020.

Mr. Addison is a 1985 graduate of The University of Texas at Austin with a Bachelor of Science in Petroleum Engineering.

Charles (Chuck) Duginski

Chief Executive Officer

Charles “Chuck” Duginski joined Chaparral in 2019 as President and Chief Executive Officer.  

Mr. Duginski most recently served as Chief Operating Officer, Senior Vice President, and board member of Tapstone Energy, LLC.  Prior to joining Tapstone, Mr. Duginski served as Chief Operating Officer of Echo Energy.  He also served as Vice President – Southern Region Production of Continental Resources, Inc., where he had operational and technical responsibility for the Anadarko Basin.  Before Continental, Mr. Duginski held various positions of increasing responsibility at Chesapeake Energy Corporation, including District Manager – Haynesville, then Vice President – Haynesville/Barnett Business Unit.  Mr. Duginski began his career in technical roles at Mobil Oil and ExxonMobil and holds a Bachelor of Science in Mechanical Engineering from the University of Oklahoma.

Our Values

Chaparral’s focus on continuous improvement and excellence is created by our people and culture. Our success is fueled by and built on the Chaparral Values, a core set of actions and the values of our people.

Promoting Integrity

We are committed to honesty and ethical practices in every aspect of our business. We respect and value the opinions, ideas and abilities of our employees and stakeholders and recognize the importance of open communication in building successful long-term partnerships.

We hold our employees to a high standard of excellence and place a tremendous emphasis on our relationships with our neighbors, partners and vendors through our Code of Business Conduct and Ethics.

Driving Results

We approach every project, both internal and external, with meticulous attention to detail and innovative thought to help us execute at the highest possible level. Though “excellence is its own reward,” we know that it brings actual rewards as well, in the form of profits, performance and enhanced relationships.

Building Relationships

Successful relationships are built on trust, respect and open, honest communication. We appreciate diverse perspectives and respect the differences that make each of our employees, partners and neighbors unique. 

Employing Technical Excellence

We are never satisfied with the status quo. It’s why we push ourselves to research and analyze situations to understand and gain insight into problem solving and decision making as we strive toward continuous improvement. We encourage every team member to be masters in their technical area, adapt to change and never stop learning from their experience and the people around them.