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

Gavin Archbald, M.S. (Senior Ecologist 1)
408.458.3233

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.

Ginger M. Bolen, Ph.D. (Associate Ecologist)
408.458.3246

Dr. Ginger Bolen is a project manager specializing in wildlife-related regulatory compliance issues and documentation. She is also an experienced field scientist who has worked with numerous special-status species throughout California. Ginger has a U.S. Fish and Wildlife Service recovery permit approval for the California red-legged frog and California tiger salamander and a California Department of Fish and Wildlife scientific collecting permit.

Howard Shellhammer, Ph.D. (Adjunct Senior Associate)
408.458.3200

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.

Jeff P. Smith, Ph.D. (Associate Ecologist)
408.458.3245

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)
559.476.3165

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.

Jeff Zirpoli, M.S. (Senior Ecologist 1)
559.476.3163

Jeff Zirpoli is a wildlife ecologist at H. T. Harvey & Associates, with a background in ornithology, vertebrate ecology, behavioral ecology, and quantitative analysis. He has more than a decade of experience, with a strong emphasis in raptors, particularly golden and bald eagles. Jeff has worked with eagles in grassland, oak savanna, and woodland habitats in the southern Diablo Range and southern Sierra Nevada in California and in prairie-pothole grassland rocky coulee habitat in northern Montana. He is listed under a CDFW letter permit to assist with research on golden eagles and raptors.

Jeffery Wilkinson, Ph.D. (Senior Ecologist 2)
408.458.3228

Dr. Jeff Wilkinson is a herpetologist with more than 20 years of research experience in the phylogenetics, biogeography, taxonomy, natural history, and ecology of reptiles and amphibians. He is authorized under HTH’s 10(a)(1)(A) permit from the U.S. Fish and Wildlife Service to handle California red-legged frogs and California tiger salamanders throughout their ranges, and he is a Level II surveyor for the blunt-nosed leopard lizard. In addition, Jeff possesses a current scientific collecting permit for reptiles and amphibians in California, including species of special concern and the threatened California tiger salamander.

Joe Howard, M.L.A., ASLA (Principal)
408.458.3224

Joe Howard is a licensed landscape architect and leader of the Landscape Architecture group. He is well-versed in all stages of the design and planning process. Joe helps identify and resolve ecological concerns during the early stages of site design and planning, and specializes in translating complex biological issues into intelligent planning and construction documents.

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