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About Us
Aaron Gibson
Senior Restoration Ecologist, Founding Partner
Aaron brings more than 20 years of experience in the environmental field. His career began at just 19 years old at a native plant nursery before moving into large-scale restoration projects, where he discovered his lifelong passion for protecting natural resources.
In 2016, Aaron started his journey to become one of Washington and Oregon’s top stormwater & environmental compliance experts, serving as a trusted authority in clean water management and compliance. Today, he leads ERSM’s operations with integrity, responsiveness, and a people-focused approach to leadership—ensuring effective outcomes and strong relationships with every client and colleague.
Outside of work, Aaron enjoys mountain biking, camping, and spending time with his wife and two daughters.
Sarah Maher
Business Manager, Founding Partner
Sarah brings over 15 years of administrative and business management experience to ERSM. After earning her AS in Communication Studies, she gained hands-on expertise in office management, accounting, digital arts, people management, and marketing. She later completed her Bachelor’s in Business Management and now applies her diverse background to lead ERSM’s administrative operations. Her leadership and dedication help ensure strong client relationships and high-quality work.
Outside of ERSM, Sarah is a proud wife and mom of two. She enjoys coastal trips, family game nights, and experimenting with watercolor painting.
Ryan Masterman
Stormwater Analyst (CESCL), Founding Partner
With over 13 years of experience in environmental management, Ryan brings a strong background in stormwater project management, erosion control, and native plant restoration. His career has spanned native plant nurseries, reforestry, invasive species management, and stormwater companies, making him a versatile and valuable member of the ERSM team.
Passionate about sustainability and conservation, Ryan is dedicated to improving the environmental impact of infrastructure projects. In his free time, he enjoys hiking, bird watching, and exploring the outdoors with his wife.
Kate’Lyn (KT) Wills
Senior Environmental Scientist, PWS, Partner
KT brings over a decade of experience as a Professional Wetland Scientist (PWS). Her career path has taken her from veterinary medicine to marine biology and conservation, including earning her Master’s degree with a specialization in sea turtle research. Today, she applies her expertise in wetland and stream delineation, shoreline and habitat evaluations, mitigation design, project planning, and environmental permitting.
Outside of her professional work, KT is a proud mother of two, an advocate for Autism Awareness, and enjoys hiking, gardening, and exploring the outdoors with her family.
Brian Nikolas
Erosion & Sediment Control Analyst (CESCL), Partner
Brian brings over six years of experience in the environmental sector. After earning his bachelor’s degree in Environmental Science from Washington State University, he began his career on a restoration crew, gaining hands-on experience managing wetland and stormwater projects across Washington and Oregon.
Since then, Brian has developed expertise in wetland delineations, restoration project management, stormwater compliance, and erosion control as a certified CESCL. He is dedicated to advancing restoration outcomes and protecting local ecosystems.
Austin Ada
Restoration Ecologist, Partner
Austin brings five years of experience in ecological restoration and mitigation. A graduate of Washington State University with a degree in Environmental and Ecosystem Sciences, he has managed projects throughout Washington and Oregon, from the sagebrush landscapes of the east side to the watersheds of Vancouver. His specialized expertise in noxious weed management plays a vital role in the long-term success of ERSM’s restoration projects.
Outside of work, Austin enjoys snowboarding, dirt biking, and exploring the Pacific Northwest. He also dedicates time on weekends to volunteering with local nonprofits.
Cameron Tilley
North Washington Stormwater Analyst & Ecologist, Partner
Cameron brings over six years of experience in the environmental field, working his way from field crew to project manager and now leading ERSM’s expansion into Northern Washington. His career has fueled a deep passion for protecting natural environments and vital waterways through regulatory compliance, client and public education, and positive project outcomes.
Known for his kindhearted approach and respect for others, Cameron builds strong relationships with clients, colleagues, and communities. Outside of work, he enjoys one-wheeling the hilly streets of Bremerton and playing adventure-style games with his two children, ages 6 and 9.
RESTORING THE PLACES NATURE CALLS HOME
