Who We Are

Who We Are

Our Professionals

Our Professionals

We have nearly 80 staff in six offices in California and Hawai‘i. 3 ways to get in touch with one of our senior experts:

  • Click on the yellow bird and "tell us about your project" 
  • Search our directory of senior staff to find the expertise you need
  • Call 408.458.3200

Find a Professional

Robyn Powers, M. S. (Senior Ecologist 1)
805.756.7423

Robyn Powers is a senior wildlife ecologist and project manager in the firm’s San Luis Obispo office. She has particular interest and experience in endangered species research and monitoring and in mammal ecology. Much of her work has been in California ecosystems, including the Channel Islands, coastal scrub and oak woodland communities, the Sierra Nevada, and the Mojave Desert. 

Ron Duke, M.A. (President and Principal)
408.458.3201

Ron Duke is a wildlife and wetlands ecologist who has directed thousands of projects since he started with the firm more than 30 years ago. President of H. T. Harvey & Associates since 1990, he guides its overall technical and philosophical direction as a premier ecological consulting firm. He is an expert on the endangered salt marsh harvest mouse and the ecology and restoration of the marsh habitat on which it depends.

Scott Terrill, Ph.D. (Vice President, Principal)
408.458.3203

Dr. Scott Terrill, vice president and the principal in charge of our Wildlife Ecology group, our Hawaii office, and research activities, is an internationally recognized avian ecology and behavior expert, with more than 35 years of experience, 25 of them at H. T. Harvey & Associates. He has made major contributions to the study of bird migration and movements, and also has a strong background in vertebrate community ecology and population biology in terrestrial, estuarine, and marine habitats.

Shahin Ansari, Ph.D. (Senior Ecologist 1)
808.499.9092

Dr. Shahin Ansari has more than 15 years of experience in tropical botany, plant ecology, and the invasion biology of island ecosystems. She has conducted extensive ecological research in Hawai‘i and has a deep understanding of the Islands’ wide-ranging habitats, unique native biota, and ecological history. The expertise she brings to our Hawai'i office includes Hawaiian flora, vegetation ecology, invasive species, endangered species, wetlands, habitat restoration, environmental mitigation, and preparation of conservation management plans.

Sharon Kramer, Ph.D. (Principal)
707.822.4141

Dr. Sharon Kramer is a principal, and heads our North Coast office and the Fish Ecology team. She has more than 25 years of experience in aquatic ecology and fisheries biology in the Pacific Northwest, California, Australia, and Hawai‘i. Sharon is well-versed in fish and aquatic habitat restoration and monitoring, and project permitting, with extensive federal Endangered Species Act work. Her most recent focus has involved assessing and mitigating the environmental effects associated with renewable energy projects.

Steve Rottenborn, Ph.D. (Vice President, Principal)
408.458.3205

Dr. Steve Rottenborn is a Vice President, and principal in the Wildlife Ecology group. He specializes in resolving issues related to special-status wildlife species and in meeting the wildlife-related requirements of federal and state environmental laws and regulations. His training has focused on wildlife biology and avian ecology, and he is particularly interested in wetland and riparian habitats and the effects of human activities on birds. Steve’s experience extends to numerous additional special-status animal species as well.

Will Spangler (Senior Ecologist 1)
408.458.3255

Will Spangler is a senior restoration ecologist and project manager at H. T. Harvey & Associates. Will has worked across a variety of habitats including riparian, grassland, chaparral/coastal scrub, coastal dune, and oak woodland ecosystems, and has experience with both project-focused and community-based restoration. He has a particular interest in the impact of invasive plant species on restoration planning and long-term success and has developed management plans and strategies for a range of invasive plant species. Will has contributed to research on invasive plant species control and revegetation methods. He is trained in the California Rapid Assessment Method (CRAM) for riverine and depressional wetland systems and in conducting U.S. Army Corps of Engineers wetland delineations.

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