Pinyon Environmental | Technical Staff

Technical Group Managers

Holly Bender, PhD

Technical Group Manager – Economic and Regulatory Analysis


Holly is our guru in socioeconomic analysis, economic impact analysis and input-output modeling, environmental justice analysis, stakeholder analysis, benefit-cost analysis, econometric analysis, and survey research. She is certified in both BLM socioeconomic analysis and advanced IMPLAN® economic impact analysis.

Ashley Bushey

Technical Group Manager - Cultural Resources


Ashley’s focus is on historic preservation and planning, emphasizing Section 106 of the National Historic Preservation Act. She supports projects and clients with technical expertise in Section 106 compliance, Section 4(f) analysis and documentation, and identifying innovative strategies to advance a project’s goal while preserving our historic heritage.

Russ Cirillo, PE

Technical Group Manager – Remediation


Russ is a skilled project manager in remediation, permitting and regulatory compliance projects. His projects have been executed under the regulatory authority of the Colorado Department of Public Health and Environment, Colorado Department of Labor and Employment’s Division of Oil and Public Safety, Wyoming Department of Environmental Quality, Texas Railroad Commission and United States Environmental Protection Agency.





Robyn Kullas


Technical Group Manager – NEPA and Planning


Robyn is experienced in managing NEPA compliance projects. Her experience includes preparing technical documentation, evaluating impacts, and identifying mitigation and permitting measures for Environmental Assessments, Environmental Impact Statements, and Categorical Exclusions, and specializes in project management and Section 4(f) documentation and clearances.

Michelle Marin

Interim Technical Group Manager – Due Diligence


Michelle is a geologist with experience in pre-acquisition site assessments, all phases of soil and groundwater investigations and remediation, regulatory compliance and reporting at the local, state and federal levels, Spill Prevention Control and Countermeasures plans, and underground storage tank management and removals.

Michelle Marin

Technical Group Manager - Regulatory Compliance


Michelle is a geologist with experience in pre-acquisition site assessments, all phases of soil and groundwater investigations and remediation, regulatory compliance and reporting at the local, state and federal levels, Spill Prevention Control and Countermeasures plans, and underground storage tank management and removals.

Karin McShea

Technical Group Manager – Biological Resources


Karin is a biologist and ecologist with technical expertise in noxious weed inventories/mapping, qualitative and quantitative botanical surveys and inventories, sensitive and rare plant surveys, wetland delineations, GIS mapping and Management Indicator Species reports. She is also experienced in evaluating biological resources and impacts supporting NEPA evaluations, including Categorical Exclusions, Environmental Assessments and Environmental Impact Statements..



Bridget Mitchell, PE

Technical Group Manager – Environmental Engineering


Bridget specializes in stormwater management design, sub-slab venting system design, and permitting site/civil work. Her responsibilities include hydraulic design, hydrologic analysis, permitting, and coordinating with key regulatory agencies.

Tricia McCready


technical group manager - industrial hygiene


Tricia McCready has over 15 years in the Industrial Hygiene (IH) and Environmental Health & Safety (EHS) fields. She brings private industry experience from her background as an independent IH/ EHS consultant, a medical laboratory Regional EHS Manager and an onsite Industrial Hygiene contractor for a large brewery. Her specialties include various chemical and dust air monitoring, noise dosimetry, employee exposure assessments and EHS training.