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

Debra Bishop, M.S. (Principal)

Debra Bishop is a principal, environmental planner, and senior restoration ecologist, leading our Sacramento office. She has more than 25 years of experience managing complex multi-disciplinary projects, performing environmental analyses, advising clients, and designing and implementing diverse restoration projects throughout California. She specializes in flood management projects, particularly those in the Central Valley. 

Ellen T. Pimentel, M.A. (Senior Ecologist 1)

Ellen Tatum Pimentel is a senior plant ecologist at H. T. Harvey & Associates, with nearly 15 years of experience. She plans, implements, and monitors a variety of projects in vernal pool, grassland, riparian, freshwater and tidal wetland, and coastal dune communities throughout California. Ellen has led or conducted vernal pool branchiopod and amphibian surveys, vegetation classification and mapping, invasive plant mapping and control, botanical surveys, and vegetation and wetland monitoring and ecological assessments.

Ethan M. Barnes, M.S. (Senior Ecologist 1)

Ethan Barnes is a senior plant ecologist at H. T. Harvey & Associates with more than 15 years of experience. He has conducted surveys for special-status plant species, performed wetland delineations, and mapped vegetative cover types in a wide variety of plant communities throughout California and other parts of the United States. His botanical surveys have involved inventorying plant species in numerous habitat types, including wetland, grassland, chaparral, oak woodland, montane, desert, halophytic, and anthropogenic communities. Ethan has identified and observed more than 100 special-status plant species in their native habitats throughout California. He holds a federal permit to conduct surveys for listed vernal pool crustaceans and is approved by CDFW as a Level II surveyor for blunt-nosed leopard lizard.

Gavin Archbald, M.S. (Senior Ecologist 2)

Gavin Archbald is a senior restoration ecologist and project manager with H. T. Harvey & Associates, specializing in the management of restoration projects in wetland and riparian communities. He has nearly a decade   of experience working in tidal marsh, freshwater wetland, riparian, coastal scrub, marsh-upland ecotone, and oak woodland communities. He is skilled in delineating wetland and riparian habitats and is certified in applying the California Rapid Assessment Method (CRAM) in tidal marshes, depression wetlands, and riparian areas. Gavin has extensive experience mapping and monitoring a range of vegetation communities, including through the use of remote sensing technology.

Howard Shellhammer, Ph.D. (Adjunct Senior Associate)

Howard Shellhammer is the primary authority on the endangered salt marsh harvest mouse (Reithrodontomys raviventris) and co-authored the first recovery plan for the species.  Howard has carried out work on the cytotaxonomy, ecology, and distribution of the mouse for over 40 years.  He has overseen more than 150 salt marsh harvest mouse projects and trained dozens of students and staff on the techniques for handling and identifying this species. His other major area of long-term research is the fire ecology of giant sequoias (Sequiadendron giganteum), a project that he has continued periodically since 1964.  He has also studied the biological effects of off-road vehicles and predator-prey relationships of large mammals in the Inner Coast Range of California.

Jacquie Maher, MS (Senior Ecologist)

Jacquie Maher is a senior wildlife ecologist and project manager. She has more than a dozen years of experience with aquatic and wildlife ecology. Jacquie conducts protocol surveys for protected species, wildlife trapping and monitoring, nesting bird surveys, wetland and restoration monitoring, salmonid snorkel surveys, and non-native weed surveys.

Jeff P. Smith, Ph.D. (Associate Ecologist)

Dr. Jeff Smith is an Associate ecologist and ornithologist, with particular expertise in raptor biology, ecology, and conservation. His raptor expertise he brings to our involvement with renewable energy projects greatly improves our ability to determine the effects of these projects on raptors and identify the most effective measures to mitigate these effects.

Jeff Seay, B.A. (Senior Ecologist 2)

Jeff Seay is a wildlife ecologist and ornithologist, with 30 years of experience identifying birds in California. In addition to his expertise on birds, Jeff has extensive knowledge of other wildlife found in the Central Valley of California, including mammals, reptiles, and amphibians, and he is knowledgeable about the distribution and habitat requirements of those species protected by the State and federal governments.