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

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

Kellen Sullivan, Q.I. Project Manager

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 10 years of experience as a source tester and environmental chemist. As a project manager for the consulting team, Kellen provides air permitting and compliance support for a variety of industries to complete challenging air quality projects and reduce emissions. He prepares permit applications such as pre-construction, Title V operating permits, and registrations for a variety of industries. He works with clients to ensure they are operating in compliance

Kellen Sullivan, Q.I. Project Manager2022-10-10T14:32:22-06:00

Emma Williams, ASP Environmental Scientist

Emma joined Bison in 2021 as an Environmental Scientist in the consulting services group in Helena. She has more than 10 years of regulatory compliance experience with focuses in permitting, compliance and safety regulation. Emma has a Bachelor of Science degree in Aquatic Biology from Bemidji State University in Minnesota. Emma assists with a variety of projects including permitting of major sources, minor sources and permits to construct (NOC), compliance assistance, reporting, and compliance audits. Beyond air quality, she also has extensive experience with water permitting, regulation, and compliance including National Pollutant Discharge Elimination System (NPDES), Industrial Storm

Emma Williams, ASP Environmental Scientist2021-12-21T09:43:01-07:00

Cade Barthuly E.I.T. Staff Engineer

Cade joined Bison Engineering Inc. in 2021 as a member of the consulting and permitting team in Helena, as his first career position out of college. He has a Bachelor of Science degree in Chemical Engineering from Montana State University. At Bison, Cade assists clients in preparing pre-construction air permit applications and modifications, annual emission inventories, and compliance databases. He works with clients in managing air quality projects for upstream and midstream oil and gas facilities as well as researches and collects data for various air quality projects. Cade also creates air pollutant dispersion models, processes meteorological data,

Cade Barthuly E.I.T. Staff Engineer 2021-12-21T09:44:21-07:00
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