The Indian Energy Service Center (IESC) coordinates and processes Indian energy, mineral and renewable energy development and leasing activities across the Department of the Interior’s bureaus. The IESC is staffed by the Bureau of Indian Affairs (BIA), the Office of Natural Resources Revenue (ONRR), the Bureau of Land Management (BLM), and the Bureau of Trust Funds Administration (BTFA), formerly the Office of the Special Trustee for American Indians (OST).  

To contact IESC and its constituent branches, please use the staff directory below. 

Staff Role Name/Email Contact Agency
IESC Director Carla Clark BIA
Office of Deputy Director
IESC Deputy Director – Acting Craig Williamson BLM
IESC Trust Reform Liaison Johnna Spriggs BIA
IESC Program Analyst Sharon Spotted Bear BIA
IESC Administrative Specialist Shelli Grywusiewicz BIA
Real Estate Services Branch
Real Estate Services Branch Chief Albert Bond BIA
IESC Realty Specialist Karen Austin BIA
IESC Realty Specialist – Field Liz Berndt BIA
IESC Realty Specialist LaWanda Gibson BIA
IESC Realty Specialist – Field Renita Howling Wolf BIA
IESC Realty Specialist Laura Little Iron BIA
IESC Realty Specialist Jason Padilla BIA
IESC Natural Resources Specialist – GIS Hayes Haas BIA
System Administrator III Mike Gutierrez BIA
Engineering Services Branch
Engineering Services Branch Chief Craig Williamson BLM
IESC Supervisory Petroleum Engineer Jack Savage BLM
IESC Petroleum Engineer Mitch Hasbrouck BLM
IESC Petroleum Engineer Chris Kostelecky BLM
IESC Petroleum Engineer Abdinur (Abdi) Salad BLM
IESC Production Accountability Technician Linda Bozeman BLM
IESC Production Accountability Technician Judith Yeager BLM
IESC Land Law Examiner Mayom Achuk BLM
IESC Land Law Examiner Jami Russell BLM
Mineral Services Branch
IESC Supervisory Minerals Revenue Specialist Amanda Garrison ONRR
IESC Minerals Revenue Specialist Heather Cillessen ONRR
IESC Minerals Revenue Specialist Justin Gallegos ONRR
IESC Minerals Revenue Specialist Matt Moore ONRR
Beneficiary Services Branch
Beneficiary Services Branch Chief Michelle Morrison BTFA
IESC Accounting Technician Sunny Rasmussen BTFA
IESC Trust Accounts Administrator Katrina Brown BTFA

Contact Us

Indian Energy Service Center
13922 Denver West Parkway, Building 54, Suite 300
Lakewood, CO 80401
9:00 a.m.–4:00 p.m. MDT, Monday–Friday.