Management Team

UniSource Energy Services’ daily operations are supervised by local managers who are committed to providing safe, reliable service to their communities. Electric service is provided through a UES subsidiary called UNS Electric, Inc., while natural gas service is provided through a subsidiary called UNS Gas, Inc. These local efforts are overseen and supported by executives at UES’ Tucson-based parent company, UNS Energy Corporation, and sister company Tucson Electric Power (TEP).

UES Management Team

  • Terry Nay, Senior Director of Corporate Safety and UNS Electric, oversees electric operations across Arizona.
  • Bill DeJulio, Senior Director of Electric Operations, manages electric service in Mohave County.
  • Nathan Shelley, Senior Director of Gas Operations, manages gas service in northern Arizona.
  • Roberto Guevara, District Manager of Gas and Electric Operations, oversees gas and electric service in Santa Cruz County.
Hutchens (1)

David G. Hutchens

President and Chief Executive Officer

Mr. Hutchens is President and CEO of TEP and its parent company, UNS Energy Corporation. He served as a nuclear submarine officer in the U.S. Navy and worked as an engineer before joining TEP in July 1995. He advanced to various management positions and became a Vice President in January 2007 before being named President in December 2011 and Chief Operating Officer in August 2013. He assumed his current role as the company’s top executive in May 2014.

Mr. Hutchens graduated from the University of Arizona with a bachelor's degree in aerospace engineering and an MBA with an emphasis in finance.

Kevin Larson

Kevin P. Larson

Senior Vice President and Chief Financial Officer

Mr. Larson is Senior Vice President and Chief Financial Officer. A 26-year veteran of TEP, Mr. Larson served in a variety of capacities in the treasury and finance areas before being named CFO in 2000. Mr. Larson also serves as Treasurer of UNS Energy.

Mr. Larson is a Chartered Financial Analyst and has a bachelor's degree in economics from the University of Minnesota.

Kentton C. Grant

Kentton C. Grant

Vice President, Finance and Rates

Mr. Grant is Vice President of Finance and Rates. Mr. Grant joined TEP in 1995 and has held management positions in financial planning, capital resources and treasury services. Mr. Grant also serves as Treasurer of UES and TEP. Prior to joining TEP, Mr. Grant worked on the staff of the Public Utility Commission of Texas.

Mr. Grant is a Chartered Financial Analyst who earned a bachelor's degree in civil engineering from Purdue University and an MBA from the University of Texas at Austin.

Susan Gray

Susan Gray

Vice President of T&D Operations and Engineering

Ms. Gray is Vice President of T&D Operations and Engineering. Susan came to Tucson Electric Power as a student engineer in 1994 before being hired in 1997 as an Energy Management System engineer. Promoted to supervisory roles along the way, she advanced to Superintendent of T&D Design/Build in 2004. She was named Director, Design & Construction Services in 2011 and was promoted to Senior Director, T&D in 2013.

Ms. Gray has a Bachelor’s degree in Electrical Engineering and a Masters in Business Administration from the University of Arizona

Todd C. Hixon

Todd C. Hixon

Vice President and General Counsel

Mr. Hixon is Vice President and General Counsel of UNS Energy, UES and TEP. Mr. Hixon joined TEP after three years in private practice and advanced to Associate General Counsel before being named to his current role in May 2011.

Mr. Hixon has a bachelor's degree in architecture and a Juris Doctorate from the University of Arizona.

Karen G. Kissinger

Karen G. Kissinger

Vice President and Chief Compliance Officer

Ms. Kissinger is Vice President and Chief Compliance Officer. Ms. Kissinger joined TEP in January 1991 after serving as a senior manager at the accounting firm of Deloitte & Touche.

Ms. Kissinger is a Certified Public Accountant. She has a bachelor's degree in Spanish from the University of Virginia and an MBA from the University of Arizona.

Mark Mansfield

Mark Mansfield

Vice President, Energy Resources

Mr. Mansfield is Vice President of Energy Resources. He joined the company in 2008 most recently serving as Senior Director of Generation. Prior to joining TEP, Mr. Mansfield held various leadership positions at PacifiCorp Energy.

Mr. Mansfield has a bachelor’s degree in mechanical engineering from Brigham Young University and an MBA from the University of Utah.

Frank P. Marino

Frank P. Marino

Vice President and Controller

Mr. Marino is Vice President and Controller. Before joining TEP in January 2013, he was a Vice President and Chief Financial Officer of the wind and solar businesses of The AES Corporation, a global power company.

Mr. Marino is a Certified Public Accountant and has a bachelor's degree in accounting from the State University of New York and an MBA from Fairleigh Dickinson University.

Catherine E. Ries

Catherine E. Ries

Vice President of Customer and Human Resources

Ms. Ries is Vice President of Customer and Human Resources. Before joining TEP in 2007, Ms. Ries was Vice President of Human Resources for Clopay Building Products Company, a division of Griffon Corporation. Ms. Ries also spent more than a dozen years in the airline industry, where she specialized in development and training.

Ms. Ries has both a bachelor's degree in fine arts and an MBA from Arizona State University.

Jo Smith

Jo Smith

Vice President of Public Policy

Ms. Smith is Vice President of Public Policy. Jo joined TEP in 2003 as Director of Investor Relations after having previously served in that role at Portland General Electric. She advanced to Director of Regulatory Services in 2011 and was promoted to Senior Director of Regulatory Services and Corporate Communications in 2013.

Ms. Smith is a Certified Public Accountant and has a Bachelor’s degree in Accounting from Michigan State University

Herlinda H. Kennedy

Herlinda H. Kennedy

Corporate Secretary

Ms. Kennedy is Corporate Secretary. She has held a variety of positions during three decades at TEP, including assistant Corporate Secretary. Ms. Kennedy was elected to her current position in 2006.

Ms. Kennedy is a Certified Legal Assistant and has an associate's degree of applied science - paralegal from Pima Community College.