who we are

Jeff Peacock, PE
Chief Executive Officer

Jeff joined Parametrix in 1990 as a transportation staff engineer. In 2008, he became president and chief executive officer. He is responsible for overall company growth and profitability. Jeff oversees company-wide operations, strategic planning, and business development activities.

John Willis, PE
President

John joined Parametrix in 2017 and served as the senior vice president overseeing the operations in Oregon and Southwest Washington prior to being appointed President in 2022. John has over 25 years of experience in the A&E industry in a variety of leadership roles and has managed some of the region’s most significant infrastructure projects.

Brent Diemer
Executive Vice President & Chief Financial Officer

Brent joined Parametrix in 2022 as executive vice president and chief financial officer. He brings over 25 years of industry experience, specializing in financial management, business growth and expansion strategy, and organizational culture development.

Roger Flint
Chief Operating Officer

Roger joined Parametrix in 2017 as chief operating officer. Roger has 30 years of experience in infrastructure development as well as all aspects of public works, transportation, and utility operations. Roger leads regional operational units and is responsible for company-wide programs including project delivery. He is also actively involved in the firm’s business development objectives for growth strategies.

Jeanna Hanenburg

Jeanna joined Parametrix in 2000. As the director of human resources, she is responsible for the team of human resources professionals who manage all people programs and processes from recruiting to retention of employees.

Denise Ledingham

Denise joined Parametrix in 2000. She has held several roles in the company, all involving communication and cross-office collaboration which is the passion behind how she approaches her work and her commitment to employee ownership.

Liz Kelly, PE, PMP, CRL

Liz joined Parametrix at the beginning of 2021 as the senior vice president overseeing operations in Puget Sound and strengthening our water practice. She has 30 years of experience in water, wastewater, drainage, and solid waste utilities work as well as transportation and rail asset management services.

Bardia Nezhati, PE, PTOE

Bardia joined Parametrix in 2018
as the senior vice president of
Las Vegas operations. His 34-year professional experience includes a unique blend of transportation planning and engineering, delivering large-scale projects and programs as project manager, principal-in-charge, and in key advisory roles. Bardia’s role includes providing transportation planning and engineering services
to clients while also growing the firm’s presence in the greater
Nevada region.

David Pennington

David joined Parametrix in 2017 and is the vice president of Infrastructure and Environmental Services for the Southwest region including offices in Albuquerque, NM and Salt Lake City, UT. He has 20 years of experience providing transportation planning services for transit, urban and rural highways, municipal streets, and NEPA analysis and documentation projects. David is responsible for growing the transportation and environmental services in New Mexico and Utah as well as further developing the firm’s presence in Colorado and Arizona.

Darby Watson, AICP

Darby joined Parametrix in 2019 as a vice president overseeing transportation and community building in the Puget Sound region, including offices in Seattle, Tacoma, Puyallup, and Bremerton. She has over 20 years of experience specializing in managing transportation and urban planning programs.

Daryl Wendle

Daryl joined Parametrix in 1996 and has held a variety of roles in the company including marketing coordinator, project manager, and principal consultant. He specializes in transportation projects, with special expertise in rail transit and highways.