Our Team

As the name suggests, Sage Institute is comprised of uncommonly skilled, highly trained professionals at the top of their fields. Sage’s principals have provided practical and effective consulting services to public agencies, educational institutions, and private organizations for the majority of their careers. Sage Institute brings together professionals with diverse backgrounds and skills, and applies these skills—including project management, technical expertise in biology, planning, and environmental science—to provide cost-effective and efficient solutions for a growing and satisfied client base.
David Wolff

David Wolff serves as the Principal Ecologist and President for SII and is a Certified Professional Wetland Scientist with over 30 years of professional experience. Mr. Wolff has special expertise in both flora and fauna, including terrestrial, freshwater aquatic, estuarine, and marine environments. He is knowledgeable in many bioregions of California including Southern California coastal, inland, and desert regions, Central California coastal & inland areas, Great Valley, and Sierra Nevada foothills. Along with his regional and landscape-scale resources planning experience, he is also an accomplished wetland scientist, botanist, and wildlife biologist well versed in endangered species issues. Throughout his career, David Wolff has conducted and managed studies, prepared reports, obtained regulatory compliance permits, monitored construction projects, and managed projects and staff for SoCalGas, and a diverse group of energy, general aviation airports, public and private sector projects. David Wolff has conducted and managed endangered plant and wildlife species surveys, holds vernal pool fairy shrimp survey Recovery Permit TE090849-2, and is a USFWS/NMFS approved California red-legged frog, California tiger salamander, steelhead, least Bell’s vireo, southwestern willow flycatcher, and San Joaquin kit fox construction monitor. He has facilitated ESA Section 7 Formal Consultations and has managed the preparation and implementation of project-specific and large-scale regional multi-species Habitat Conservation Plans that have involved city and county land use approval processes and agency/public consensus building programs. He is experienced in CEQA/NEPA and California Coastal Act compliance. David Wolff is a highly trained and experienced wetland scientist whose skills include the delineation of wetlands and jurisdictional determinations, Clean Water Act Section 404 permitting, mitigation planning, and the creation, restoration, and monitoring of wetland, riparian, and upland habitats. He has assisted clients with obtaining Individual and Nationwide Permits, and Regional General Permits from the Corps for public and private development and infrastructure projects.
Jason Kirschenstein

Jason Kirschenstein serves as Principal Biologist and Vice President for SII and is highly experienced in general and special-status wildlife and vegetation surveys, mitigation planning, regulatory compliance, Geographic Information System (GIS) applications, and environmental impact analysis. Mr. Kirschenstein is well versed in the planning process, and has successfully performed as an integral member on planning and design teams. He has provided biological and regulatory compliance services for local agencies, utilities, and private development projects. Mr. Kirschenstein is well versed in construction and mitigation monitoring and habitat restoration design / implementation and has extensive experience in the preparation of permit packages for Clean Water Act Section 404 U.S. Army Corps of Engineers permits, CWA Section 401 Certifications from the Regional Water Quality Control Board, and California Department of Fish and Wildlife Section 1602 Streamed Alteration Agreements. Mr. Kirschenstein has also managed the preparation of U.S. Fish and Wildlife Service Section 7 and Section 10 documentation per the Federal Endangered Species Act and CDFW Section 2081 take authorization documentation per the California Endangered Species Act. With nearly 20 years of experience working with various GIS applications, Mr. Kirschenstein’s capabilities range from habitat suitability mapping to performing complex constraints analyses. He has worked closely with various public agencies and private interests to obtain and properly manage GIS data. Mr. Kirschenstein’s proficiency with advanced GPS technology, AutoCAD applications, image processing software, database management, and other GIS-related equipment enhances his overall GIS production and management capabilities.