Debbie Skibicki, P.E. Director of Consulting Services

Debbie is a licensed professional engineer in the state of Montana. Debbie joined Bison in 2013 and is the director of  the consulting services department . Debbie has a Bachelors of Science degree in Chemical Engineering and a Masters of Science degree in Industrial and Management Engineering from Montana State University. Debbie manages and oversees projects primarily for major source clients (e.g., lime manufacturing, power generation, petroleum refining) for construction and operation project permitting (Title V, PSD, and minor modifications), control technology strategy and analysis, applicability analyses, compliance assistance, reporting, compliance audits, enforcement strategy, and agency negotiation.

Debbie Skibicki, P.E. Director of Consulting Services2021-02-02T12:54:40-07:00

Jeffrey T. Chaffee, P.E. Executive Manager

Certifications: Professional Engineer Jeff has over 40 years of experience in engineering and in management of environmental projects and programs in industry, government, and consulting. Jeff joined Bison in 1996 and served as Vice President for many years before assuming the position of President. He holds a B.S. degree in Environmental Engineering from the Montana Tech and an M.S. in Civil/Environmental Engineering from Oregon State University. Jeff is a registered Professional Engineer in Montana. Jeff has served in a variety of technical and management roles at Bison since 1996. At Bison, Jeff has focused on managing environmental

Jeffrey T. Chaffee, P.E. Executive Manager2018-12-06T15:25:20-07:00

Harold W. Robbins Executive Manager

Hal has over 40 years of experience in engineering and in management of environmental projects and programs in industry, government, and consulting. He has a B.A. degree in physics and an M.S. degree in environmental studies.  Hal joined Bison in 1987. Hal retired from Bison in 2014 and now serves as a professional consultant on special projects. Hal has been the project manager for many PSD and NSR permit applications for power generation stations, the lime manufacturing industry, petroleum refineries, a coal-liquefaction facility, compressor stations, wood products facilities, and many other industries. As a project manager, he

Harold W. Robbins Executive Manager2019-01-11T13:37:51-07:00

Diane Lorenzen, P.E.Senior Project Engineer

Diane is a licensed professional engineer with a B.S. in Civil Engineering from Stanford University and an M.S. in Environmental Engineering from Montana Tech. She started her air quality consulting career at Bison Engineering in 1991. From 1996 through 2016, she worked as an independent air quality consultant while focusing on raising her family. Diane also worked at Montana DEQ for two years as an air quality modeling specialist. Diane rejoined Bison Engineering in 2016. Diane has a great deal of experience in air quality permitting and compliance support for wood products clients in Idaho, Washington, Oregon

Diane Lorenzen, P.E.Senior Project Engineer2019-01-11T13:56:49-07:00

Bret W. Gallo Project Engineer

Certifications: MSHA/OSHA Safety Trained Certified FLIR IR Thermographer Bret joined Bison in 2006 after working two years as a production enhancement/hydraulic fracturing engineer for Halliburton Energy Services in WY, UT, and CO where he performed slick water, hydrochloric acid, CO2, nitrogen, CobraMax, CobraFrac, and pinpoint stimulations. He holds a Bachelor of Science degree in Environmental Engineering from Montana Tech. Bret serves on the Board of Directors for Bison. Over the past 12 years and currently, he oversees and manages projects for thousands of upstream and midstream oil and gas facilities throughout tribal lands, MT, ND, WY, UT, as

Bret W. Gallo Project Engineer2019-04-24T09:13:35-06:00

Erica Shuhler, P.E. Project Engineer

Erica joined Bison in 2014. She has a Bachelor of Science degree in Chemical Engineering, a minor in Biochemistry, and a Master of Science in Soils from Montana State University, and a Master of Arts in Mathematical Sciences from the University of Montana. She is a registered Professional Engineer in Montana and Washington. As a project engineer, Erica works with clients in preparing pre-construction permit applications and modifications, annual emission inventories, compliance audits and certification reports, control technology analyses, operation and maintenance plans, Title V and PSD permit applications, air dispersion modeling, and compliance databases. She would

Erica Shuhler, P.E. Project Engineer2018-12-06T15:52:29-07:00

Brian Murphy, E.I.T. Project Engineer

Brian joined Bison in 2013. He works in the Permitting group and frequently assists with source testing projects. He graduated from Carroll College with a Bachelor’s of Science degree in Civil Engineering with an environmental emphasis. Brian has provided air permitting and regulatory compliance assistance to clients from a variety of industries including: limestone, hard rock, and coal mining/processing; timber and wood products; biofuel production and biorefineries; baseline and peaking electrical generation with coal and natural gas, cement production; grain malting; and food production. Brian has specialized in dispersion modeling analyses and supports spatial analyses using Geographic Information

Brian Murphy, E.I.T. Project Engineer2019-01-11T13:43:39-07:00

Kellen Sullivan, Q.I. Environmental Scientist

Kellen joined Bison in 2015. He has a Bachelors of Science degree in Biology from Beloit College and is an environmental scientist in the Helena office. Kellen has five years of experience as a source tester and environmental chemist. As a member of the Source Testing group, Kellen conducts air emissions testing in accordance with EPA methods for both engineering and compliance purposes for a variety of clients. He has extensive experience and knowledge operating Boiler MACT compliance testing, Title V compliance testing, JJJJ and ZZZZ testing, and fourier transform infrared spectroscopy (FTIR), which is used to

Kellen Sullivan, Q.I. Environmental Scientist2019-04-23T22:00:23-06:00

Jennifer Davis, E.I.T. Project Engineer

Certifications: SWPPP administrator Master Gardener Emergency Response First Aid (CPR/AED) Jennifer joined Bison in October 2018 in the consulting services group in Helena. She has more than ten years of regulatory compliance experience with focuses in permitting, compliance, oil and gas inspection, National Environmental Policy Act (NEPA) document preparation, Spill Prevention Control and Countermeasure (SPCC) plans, and Phase I Environmental Site Assessments (Phase I ESA). She has worked alongside numerous tribal, federal, state, county and local agencies in the Midwest. Jennifer brings a broad expanse of experience to Bison with her previous work relating to oil and

Jennifer Davis, E.I.T. Project Engineer2021-02-02T13:17:49-07:00
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