Pax’s staff and associates are comprised of scientists, biologists, planners and experienced program managers.  Through this combination of expertise and environmental disciplines, we offer a full-service and solutions-based approach to your projects. 


Brandon Titus / Principal

Mr. Titus is a graduate of the United States Military Academy at West Point with a B.S. in Systems Engineering, and a former Captain in the United States Army. He obtained a M.S. in Environmental Science and Sustainability from National University. He has over 13 years of hands-on experience as a project manager, systems engineer, civil affairs and information operations officer, and team collaborator. It is this experience that brings values-driven leadership to the Pax team, and a holistic approach to each project or program. He plays an integral role in the oversight of complex projects, providing technical review and training and management of environmental professionals. Mr. Titus has proven successful in clearly communicating objectives, working in interdisciplinary team settings, and synthesizing broad perspectives, knowledge and skills.


Brian Holly / Principal

Mr. Holly has over 16 years of management experience with interdisciplinary environmental and natural resource projects throughout California including restoration ecology, wildlife biology, ecosystem management, environmental policy and renewable energy. He has a Master of Environmental Management, Ecosystem Science and Conservation from Duke University, and has extensive experience conducting aquatic/terrestrial biological surveys, focused special-status species studies and biological assessments. In addition, he serves as a senior project manager and program lead for several large multidisciplinary projects, some with budgets exceeding $4M. Mr. Holly has established a long list of state and federal agency relationships and provides CEQA/NEPA analysis as well as environmental regulatory permitting expertise to clients in all sectors. He also serves as an insightful adviser regarding compliance with state and federal endangered species requirements. He also served on the board of directors for the Ojai Valley Land Conservancy and is Project Director for on-going restoration projects in the Ventura River Watershed.


Iggy Sharp / Senior Project Manager

Mr. Sharp has over ten years of experience in managing and conducting ecological and environmental projects including wildlife surveys and monitoring, restoration ecology, water conservation, and renewable energy systems. Mr. Sharp has a Master of Ecology, Evolution, and Marine Biology from the University of California, Santa Barbara. He previously worked as a wildlife biologist conducting surveys of sensitive species such as the desert tortoise, burrowing owl, and kit fox, conducted water conservation surveys for hundreds of households resulting in tens of millions of gallons of water conserved annually, and managed over 100 residential solar projects from start to finish resulting in nearly a megawatt of installed solar power.


Sam Stewart / Senior Biologist

Sam Stewart is a Senior Biologist with 20 years of field experience in biological services. His experience includes biological constraints analyses; focused surveys for special status wildlife species; fish and aquatic macroinvertebrate sampling; complex analysis of food web relationships; aquatic toxicology; design and establishment of compensatory mitigation sites; wildlife relocation and long-term monitoring; long-term population studies; and invasive species control programs. He has extensive focused survey experience with fish and herpetofauna, including Threatened and Endangered species such as Santa Ana sucker, unarmored three-spine stickleback, arroyo toad, California red-legged frog, mountain yellow-legged frog, desert tortoise, and Coachella Valley fringe-toed lizard. Mr. Stewart is a CDFW-trained practitioner of the Surface Water Ambient Monitoring Program (SWAMP) and can conduct rapid bioassessment of streams and wetlands per State Water Resources Control Board (SWRCB) standard operating procedures. He has conducted investigations in varied geographic areas including; deserts and watersheds of Los Angeles, Orange, San Diego, San Bernardino, Riverside, Imperial, Ventura, Santa Barbara, San Luis Obispo, Monterey, Kern, Fresno, and Tuolomne Counties in California as well as the deserts of Arizona.


Jennifer Russell / Senior Biologist

Ms. Russell has proven expertise in focused field surveys for sensitive species and other biological resources in multiple habitats. She possesses the knowledge and leadership to instruct crews regarding environmental laws and regulations including the Migratory Bird Treaty Act, storm water pollution prevention plans (SWPPP), the Clean Water Act Section 404 and CDFW Sections 1600-1609.  Her professional experience includes high-profile projects performing nesting bird and burrowing owl support as well as biological construction monitoring.  She is well versed in preparing technical reports, jurisdictional non-wetland delineations, desert tortoise surveys, focused rare plant and tree surveys, burrowing owl monitoring and tree/habitat/environmental assessments. In addition, she has extensive experience in wildlife rehabilitation and animal handling in multiple wildlife rehabilitation centers in both Illinois and California.


Colleen Del Vecchio / Senior Biologist

Mrs. Del Vecchio has 9 years professional experience conducting biological surveys, focused special-status species surveys, and biological assessments with a focus on habitat conservation. Her work experience includes performance of protocol-level surveys for federal and state (CA, CT, MA) aquatic and terrestrial wildlife; handling, relocating, and rescuing aquatic and terrestrial wildlife; habitat restoration; water quality testing; and other environmental consulting services. For three years she has been an ISA certified arborist, with her Tree Risk Assessment Qualification (TRAQ). She is also an active volunteer and educator for the Ojai Raptor Center, conducting education programs in schools, libraries, and other public settings to spread awareness of native raptor species, habitat conservation, and environmental citizenship. 


Scott Bond Tomkinson / Senior Botanist

After completion of his bachelor's degree, Scott Bond worked for the Cheadle Center for Biodiversity and Ecological Restoration (CCBER) at the University of California, Santa Barbara for five years. There he developed an expertise in California plant taxonomy and an intimate understanding of ecological restoration best management practices. As UCSB’s ‘Lagoon Steward’ he managed, wrote grants for, planned and implemented restoration sites in habitats such as: oak woodlands, coast sage scrub, native grasslands, vernal pools, streams, freshwater and saltwater marshes, dunes, and bioswales. He has extensive experience leading teams performing vegetation surveys and restoration activities on multiple, concurrent grant-funded projects. Knowledgeable about GIS, he has also enjoyed developing databases and creating maps in relation to land management using ArcGIS and QGIS. Mr. Tomkinson is a new addition to the Pax team, serving as a senior botanist and assisting in project/study implementation.


Andrew Milam / Archaeologist

Mr. Milam has five years of archaeological experience, including GIS and cross training with biological technicians. He holds a Bachelor of Science in Anthropology with a Minor in Biology from Texas State University. His cultural resource experience includes phase I, II, and III excavation and survey, site documentation and report writing. His biological resource experience includes nesting bird surveys, water quality sampling, restoration monitoring and construction monitoring.


Ivett Plascencia / Biologist

Ms. Plascencia has served under the Department of Interior agencies, National Park Service and Fish and Wildlife Service, for 10 years combined. She has 5 years experience in Biological Monitoring with much of it in avian identification and botany in Southern California. Ms. Plascencia has extensive experience performing resource surveys including avian, bat, and vegetation as well as providing biological monitoring for construction and restoration projects. She has worked as Cowbird Trap Technician in the Santa Clara and Ventura River Watersheds. Her species experience includes California Condors, Bald Eagle, Golden Eagle, Peregrine Falcon, Cactus Wren, California Gnatcatcher, Red-winged Blackbird and House Finch. She has assisted in trapping Channel Islands foxes and island skunks on Santa Rosa Island, Channel Islands National Park. She also worked on the California High-Speed Rail in the Design-Build Construction Package 4 writing Environmental Clearance Reports and Pre-construction Survey packages.


Bradley Youngerman / Biologist

Mr. Youngerman has over four years of field work experience with interdisciplinary environmental projects throughout California including restoration ecology, wildlife biology, and ecosystem management. He obtained his Bachelor of Science in Biology from California State University, Channel Islands. He has extensive experience conducting aquatic and avian biological surveys, focused special-status species studies and riparian assessments.


Jordan English / Biologist

Mr. English is a biologist with Pax Environmental, Inc.  He obtained his Bachelor of Science in Environmental Systems: Ecology, Behavior and Evolution from University of California, San Diego and has worked on numerous projects in his time at Pax, which include monitoring for rare and sensitive species, conducting surveys to determine existence and location of great grey owls, and monitoring sensitive habitat restoration projects.


Henry Mooney / Biologist

Mr. Mooney is a biologist with Pax Environmental, Inc. Mr. Mooney is currently enrolled in a Global Systems Ph.D. program focused on international development, economics, and leadership. During his time with Pax, he has worked on the Deteriorated Pole Replacement Program for Southern California Edison surveying, monitoring and reporting for nesting birds and sensitive biological resources. He has also worked in the Ventura River Watershed supporting riparian restoration.


Jeremy Huey / GIS Analyst

Mr. Huey is a GIS Analyst with 9 years of experience working with GIS and geospatial technologies. He obtained a Bachelor of Arts in Anthropology from California State University, San Marcos and a Master of Science in Geographic Information Systems (GIS) from University of Denver. His experience includes many phases of project planning and execution including archaeological, biological, and UXO survey, data preparation and collection, data editing, as well as preparing report figures, fulfilling rolls as both GIS analyst and field support for archaeological, environmental, and UXO contracts. Mr. Huey has also proudly served with the United States Navy and United States Peace Corps.


Aaron Lawson / CPA / Controller

Mr. Lawson has degrees in applied mathematics and accounting, with 15 years of experience across a variety of industries. In addition to overseeing Pax Environmental’s finances, his responsibilities include managing the project cycle, from proposal to execution. He has worked with a broad spectrum of contract requirements, through state and federal agencies, as well as the private sector. He is directly involved with project managers, outside consultants and the Pax board of directors to ensure projects are completed on time and to budget.


Cali Piccirillo / Project Administrator

Ms. Piccirillo began at Pax as an intern while completing her undergraduate studies in Urban Planning and Geographic Information Systems (GIS). Ms. Piccirillo has four years of experience with interdisciplinary environmental projects and associated administrative roles. She provides project support to wide array of projects for Pax by assisting with agency compliance, client deliverables, business development, and office management.


Andrew Keller / Senior Associate

Andrew Keller is a co-founder of the Pacific Ecological Foundation and has over 18 years of experience in ecological restoration and wildlife biology. Andrew received his Bachelor of Science in Environmental Science from Northern Arizona University and a Master of Science in Biology from Arizona State University. Mr. Keller has supported a range of projects throughout California including research, public agency, energy development, and utility infrastructure projects.  Mr. Keller is a mammal specialist, working with a range of species including California sea lion, bats, mesocarnivores, and small mammals. Andrew’s research interests are focused on wildlife's response to habitat restoration and using this data to tailor habitat restoration projects to include features that improve the long-term viability of listed-species. In addition, Andrew is focused on incorporating climate change modeling data to plan habitat restoration projects to build resiliency to ensure long-term goals for species recovery are achieved. Mr. Keller serves as a senior advisor to the Pax management team.


Elizabeth Ridder / Senior Associate

Dr. Ridder is an Associate Professor at California State University San Marcos. She received her PhD at Arizona State University as well as her Masters and Bachelor of Science. Elizabeth’s academic research is focused on addressing human-environment interactions at various spatial and temporal scales in arid and Mediterranean environments. Her research is currently centered on examining regional relationships between climate, vegetation, and societies from the Bronze Age to the present in the Levant. In addition, Dr. Ridder is focused on  constructing models of Cypriot vegetation change that potentially result from climate change predictions. In Southern California, Elizabeth’s interests are in human-environment interactions specializing in human-wildlife interactions at the urban-wildland interface. This includes continuing collaborative efforts to construct a local-to-regional analyses of the potential for large utility corridors to act as suitable habitat for meso-carnivores in the form of conservation areas and corridors. This work also expands upon my previous species distribution modeling work, examining the applications and relevance of these models in conservation, land-use planning, and decision making. Dr. Ridder serves as an as-needed senior advisor to the Pax management team.