Seattle Office

Where the Mountains meet the Sound

Herrera is rooted in Seattle and many of us make our homes in communities here.

Our 60-person Belltown office is surrounded by major urban revitalization.

Exploding population growth in the midst of rich water resources creates many challenges – here we design our resilient future.


2200 Sixth Avenue
Suite 1100
Seattle, WA 98121

Driving Directions
Biking Directions



Point of Contact

Phil Coughlan

Alice Lancaster, PE

Principal Engineer

Brenda Peterson

Human Resources Manager

Brian Scott

Senior River Restoration Engineer

Bruce Carpenter

Senior Hydrogeologist

Carol Slaughterbeck, PE, PMP

Executive Vice President

Charlie Maloof

Project Accountant

Christina Merten, PE, PWS

Senior Ecologist

Dylan Ahearn, PhD

Principal Scientist

Eliza Spear, PWS


George Iftner, LG

Associate Environmental Scientist

George Ritchotte, PWS

Senior Scientist

Gina Catarra

Project Scientist

Gretchen Kayser


Ian Mostrenko, PE

Associate Engineer

Jeff Parsons, PhD, PE


Jenn Schmidt, GISP

Spatial Science Manager

Jennifer Swanson


Jess Brown


Jill Patterson

Marketing Manager

John Lenth

Water Practice Director

Jordyn White

Marketing Communications Assistant

Josh LeClerc

Natural Resource Scientist

Katie Wingrove, PE

Design Engineer

Lindsey Amtmann

Environmental Planner

Mark Ewbank, PE

Restoration Practice Director

Matt Fontaine, PE

Associate Engineer

Meghan Feller, PE

Senior Civil Engineer

Meghan Mullen, PE

Design Engineer

Melissa Buttin

Marketing Manager

Mike Spillane, PE

President and CEO

Nina Maas

Environmental Scientist

Private: Ondrej Sklenar, PE

Project Engineer

Pam Jackowich

Lead Word Processor

Phil Coughlan

Sustainable Development Practice Director

Rebecca Dugopolski, PE

Associate Engineer

Rob Zisette

Principal Aquatic Scientist

Shannon Wadkins

Administrative Assistant

Theresa Wood

Vice President

Tracy Rudnick

Project Accountant

Tyson Wright, PE

Associate Engineer

Thea Foulk


Nicole Trolio

Graphic Designer

Randall Taylor, PLA

Landscape Architect

Satya Dhital


Allison Nichols


Rebecca Stebbing


David Cortese, PE

Project Engineer

Shannon Gray, PE

Senior Engineer

Camryn Steiner


Andy Siegel

GIS Analyst

Sarah Nyman

Accounting Administrator

Nicholas Harris

Environmental Data Scientist