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

Stephen L. Peterson, M.S. (Senior Ecologist 1)

Stephen Peterson is a senior wildlife ecologist at 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. 

Will Spangler (Senior Ecologist 1)

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.