Who We Are

Who We Are

Our Professionals

Our Professionals

We have nearly 80 staff in five 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

Robin J. Carle, M.S. (Senior Associate)

Robin is a senior associate and ornithologist in our wildlife group with extensive experience with the biology and habitats of common and special-status wildlife species in the greater Bay Area. Her accumulated knowledge of local wildlife species and their habitats has allowed her to contribute in-depth knowledge of species’ biology to a variety of H. T. Harvey & Associates environmental documents. She has extensive experience with the regulatory requirements of CEQA as it relates to the preparation of environmental documents, and has a strong understanding of the state and federal Endangered Species Acts, which allows her to prepare effective environmental documents that fully satisfy the regulatory requirements of the agencies that issue discretionary permits.

Ron Duke, M.A. (President Emeritus, Chairman-of-the-Board)

Ron Duke is a wildlife and wetlands ecologist who has directed thousands of projects since he started with the firm more than 40 years ago. President of H. T. Harvey & Associates from 1990 through 2022 and currently chairman-of-the-board, he provides leadership on the firm's overall technical and philosophical direction. He is an expert on the endangered salt marsh harvest mouse and the ecology and restoration of the marsh habitat on which it depends. 

Sara Grove, PhD (Restoration Ecologist)

Dr. Sara Grove is a senior restoration ecologist and project manager in the San Francisco Bay Area office of H. T. Harvey & Associates with 10 years of experience.

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

Dr. Scott Terrill, vice president and the principal in charge of our Hawaii office, and company research activities is an internationally recognized avian ecology and behavior expert, with more than 50 years of experience with birds, 30 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 2)

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)

Dr. Sharon Kramer is a marine ecologist and principal who heads our California North Coast office and fish and aquatic ecology projects.  She has more than 30  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.

Stephen L. Peterson, M.S. (Senior Ecologist)

Stephen Peterson is a senior wildlife ecologist and project manager in the San Francisco Bay Area office of H. T. Harvey & Associates. His more than dozen years of professional experience have primarily consisted of research focused on habitat and anthropogenic impact associations with avian and wildlife communities. Stephen has also worked on numerous projects in the San Francico Bay Area and writes biological resource assessments to support CEQA compliance. His survey experience with special-status wildlife species includes the burrowing owl, long-billed curlew, snowy plover, golden eagle, San Joaquin kit fox, California red-legged frog (CRLF), and California tiger salamander (CTS).

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

Dr. Steve Rottenborn is a Vice President, and principal in the wildlife ecology group in the San Francisco Bay Area office of  H. T. Harvey & Associates. 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. Combining his research and training as a wildlife biologist and avian ecologist, Steve has built an impressive professional career that is highlighted by a particular interest in wetland and riparian communities, as well as the effects of human activities on bird populations and communities.