Character. Experience. Results.
David J. Tudor, President & Chief Executive Officer
Our Members and Customers depend on ACES to help them with a wide variety of Energy Risk Management needs. We couldn’t meet those needs without our hardworking and talented employees. View Bio
Mr. Tudor is responsible for the vision and management of ACES. Mr. Tudor joined ACES in May of 1999, and has helped develop the organization into a national energy risk management and transaction execution company. ACES has grown from 4 to 19 cooperative Members, and also provides services to over 50 Clients in various regions across the U.S.
Mr. Tudor has been in the energy business throughout his career and has experience in both the management of energy assets and energy trading. Prior to joining ACES , Mr. Tudor, as President of Risk Advisors, LLC, provided risk management advice to several large investor-owned utilities in the development and implementation of their risk management software systems and trading control policies.
Prior to forming Risk Advisors, LLC, Mr. Tudor was the Executive Vice President & Chief Operating Officer of Pacific Gas & Electric Energy Trading, where he managed the commercial operations in the United States and Canada.
Mr. Tudor participates on the Board Risk Committee at Wabash Valley Power Association, and is a Director on the Board of Directors of Western Gas (WES), a public corporation, where he also serves as Chairperson of the Audit Committee.
Mr. Tudor is a graduate of David Lipscomb University in Nashville, Tennessee.
David H. Claspell, Senior Vice President & Chief Financial Officer
We devote significant resources at ACES to analyzing and verifying energy market settlements statements and invoices, one of the many activities for which I am responsible. We have developed detailed processes that ensure that our Members' and Customers' energy transactions are financially settled accurately. View Bio
Mr. Claspell leads the Back Office function at ACES. His responsibilities include oversight of all energy market settlement activities for ACES’ Clients, as well as oversight of ACES’ internal accounting activities, legal support, human resources, and general administrative functions.
Mr. Claspell has more than 30 years experience in finance, accounting, taxes, and insurance, primarily in the wholesale energy industry. He began his career in public accounting and moved into corporate accounting in the tax department at AMAX Coal Company. He then spent 15 years as financial advisor and controller for one of the nation’s leading generation and transmission cooperatives (G&Ts) before joining ACES.
Mr. Claspell understands and appreciates the diverse financial requirements of both the G&Ts and their member distribution systems.
He holds a Bachelor of Science degree in accounting from Indiana State University, and is a Certified Public Accountant.
Michael T. Steffes, Senior Vice President & Chief Operating Officer
The Front Office is really the front line of Energy Risk Management. We make sure that our market transactions are always consistent with the goals and strategies that we've worked out with Members and Customers. View Bio
Mr. Steffes leads the Front Office function at ACES. He has oversight responsibility for the trading functions in ACES’ Portfolio Management – East and Western Regional groups, as well as oversight responsibility for Origination (medium-term to long-term deals), Structuring (quantitative analysis and modeling), Portfolio Delivery, Transmission Analysis, Scheduling Services, Fuels, and Environmental Services.
Mr. Steffes offers ACES Clients a unique level of management experience in energy trading, having held similar executive positions with Pennsylvania Power & Light (PP&L), Valero Energy and Hadson Gas Systems. As the Vice President of Marketing and Trading for PP&L in Allentown, Pennsylvania, Mr. Steffes led the development of the utility’s unregulated trading subsidiary into a profitable, full-service trading organization.
At Valero Energy, Mr. Steffes helped to pioneer state of the art risk management systems that provided portfolio valuation and calculated value-at-risk, which helped maximize profitability and managed the risk of Valero’s energy business. Mr. Steffes controlled one of the top ten natural gas financial books during the middle-‘90s in both size and financial performance.
At Hadson Gas, Mr. Steffes led one of the country’s leading natural gas marketing and trading businesses with a large physical and financial trading presence.
Mr. Steffes holds a Master of Business Administration degree from the University of Detroit.
Jeffrey L. Walker, Senior Vice President & Chief Risk Officer
Because there are so many inherent risks in an energy supply portfolio, and because market conditions can change so quickly, Energy Risk Management is a never-ending process. It’s like the advice you give a batter at the plate – never take your eye off the ball. View Bio
Mr. Walker leads the Middle Office function at ACES. The Middle Office has a primary focus on tracking and mitigating risk, as well as risk reporting, and risk management training and consulting. Mr. Walker’s responsibilities include oversight of all Trading Control, Credit Services, Contract Administration, Regulatory, and Corporate Development functions.
Mr. Walker has been in the energy industry throughout his career with experience in the areas of risk management, trading control, credit, contract administration, finance, power supply planning, financial planning, and accounting. As a CPA, Mr. Walker served as Controller and then Planning & Finance Manager for one of the nation’s largest cooperative power suppliers.
Mr. Walker joined ACES in February of 1999, and led the design and development of its risk management capabilities to address the wide range of risks facing today’s energy suppliers.
In addition to being a CPA, Mr. Walker holds a Bachelor of Science Degree in Accounting from Indiana University. Mr. Walker was a member of the Committee of Chief Risk Officers (CCRO), representing ACES from mid-2002 to March 2009, and served as a Director on the CCRO’s Board from October 2003 to March 2009.
Mr. Walker’s years of energy supply experience, combined with his expertise in finance and risk control, give him a unique perspective on the risk management needs of energy suppliers.
H. Annette Stamatkin, Senior Vice President & Chief Information Officer
Because ACES is such a technology-dependent company, IT plays a key role in all of the services that we provide. We are always willing to look at a piece of software that will allow us to provide our services in a more efficient, or cost-effective manner. View Bio
Ms. Stamatkin leads the Information Technology function at ACES. Ms. Stamatkin joined ACES in June 2000, having held previous executive positions with Wabash Valley Power Association and North Carolina Electric Membership Corporation (NCEMC). Ms. Stamatkin has successfully led numerous strategic, multi-million dollar implementation projects including corporate financial and wholesale billing systems, customer information systems and call centers, commodity trading and risk management systems (CTRM), energy management systems, and Supervisory Control and Data Acquisition (SCADA) throughout her career.
Ms. Stamatkin’s current responsibilities include overseeing the implementation and 24×7 support of ACES’ real-time trading, financial and analytical systems, websites and data warehousing solutions including a multi-commodity CTRM, multiple ISO/RTO trading and settlements systems, analytical and data warehousing tools, corporate financials, telecommunications including local and wide area networks (LAN and WAN), and real-time connectivity to Members’ and Customers’ EMS and SCADA systems. Ms. Stamatkin is also responsible for business continuity planning and readiness for ACES’ four trading centers: National Service Center in Carmel, IN, and Regional Trading Centers in Raleigh, NC; Maple Grove, MN; and Benson, AZ. Ms. Stamatkin brings over 25 years of information technology and energy industry experience to ACES. She has managed the deployment and support of energy trading and real-time operational systems, national telecommunications solutions for deregulated retail and wholesale power markets, and multi-commodity trading and risk management for Generation and Transmission cooperatives.
Ms. Stamatkin earned a Bachelor of Computer Science degree from the School of Engineering at Purdue University, and is a graduate of the University of Michigan’s Executive Public Utility Management Program.