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Denver, Colorado

Denver, Colorado

1873 S. Bellaire Street, Suite 1101
Denver, Colorado 80222

Denver, Colorado

1873 S. Bellaire Street, Suite 1101
Denver, Colorado 80222


(720) 779-3600


(303) 798-9462


Tamara Dipner, PE

Colorado Regional Director


Saeed Sobhi, PE

Denver Regional Manager

Saeed serves as EST’s Denver Regional Manager overseeing all company affairs and interests in the Denver and Northern Colorado. This includes, but is not limited to: construction management, roadway and bridge design, survey, and traffic engineering and management operations.

Denver Staff

Amy Backel, PE
Professional Engineer

Ghazal Batouli

Mario Castaneda
CADD Tech / Inspector

Shawn Dankenbring, PE
Water Resource Group Engineer

Joey Davidson
CADD Specialist

Chris DeRosia, PE, PTOE
Senior Traffic Engineer

Chuck Dreesen, PE
Construction Project Manager

Hamideh Etemadnia
Sr. Transportation & ITS Support

Mark Farris
Sr. ITS Traffic Designer





Gary Johnson, PE, PTOE
Chief Traffic Engineer

Kate Jones, EI
Engineer Intern

Alexandre Karami
Senior Consultant

William Kascek
Senior ITS Specialist

Phillip O’Brien
Graphics Designer

Jason Okerlund
Construction Inspection Tech

Amirpasha Peyvandi, PE
Structural Engineer

Morgan Stapleton
Marketing Assistant

Dane Tomei, EI
Engineer Intern

Denver Projects

Denver Careers

Denver News

EST Bridge Group On Site Visit to Plum Creek

EST Bridge Group On Site Visit to Plum Creek

Denver’s bridge group took a trip to visit one of our many, current local projects at Plum Creek! They were on-site to provide QA inspection of the Scott Road Bridge over Cherry Creek BT-42 girders being cast that day. Designed by EST for a land development project in...

APWA Golf Tournament

APWA Golf Tournament

Three weeks ago the EST team Jason Okerlund, Dave Knight, and Karl Brauer along with Randy Mourning, Public Works Director from the City of Sheridan, took part and won the 2018 American Public Works Association (APWA) Colorado Chapter Golf Tournament at the Lone Tree...

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Corporate Headquarters

615 N Hudson Avenue, Suite 300 Oklahoma City, OK 73102

(405) 815-3600

(405) 815-4080