Celebrating and conserving the ecological richness of California's grasslands

2019 Board of Directors & Administration



Andrea Williams - Vegetation Ecologist, Marin Municipal Water District


JP Marié - Manager, UC Davis Putah Creek Riparian Reserve


Jodie Sheffield - Sod and Seed Specialist, Delta Bluegrass Company 


Jennifer Buck-Diaz - Vegetation Ecologist, California Native Plant Society, Sacramento

Committee Chairs

Emily Allen (2019/2020), Workshop Committee Chair

Jodie Sheffield and Billy Krimmel (2018/2019), Outreach & Development Committee Co-Chairs

Jim Hanson (2018/2019), Conservation Committee Chair, Landscape Architect, natural areas conservation, planning and management

Kendra Moseley (2019/2020), Education & Information Committee Chair, Ecological Site Regional Specialist, NRCS

Dina Robertson (2019/2020), Research & Science Committee Chair, Rangeland Ecologist

Kristina Wolf (2019/2020), Grasslands Committee Chair, H.T. Harvey & Associates

Board Members-at-Large

Michele Hammond (2018/2019) Botanist, East Bay Park District and Staff Research Associate, UC Berkeley

Richard King (2018/2019), USDA/NRCS retired

Billy Krimmel (2018/2019), Owner, Restoration Landscaping Company

Felix Ratcliff (2018/2019), Post Doc, UC Berkeley

Patrick Reynolds (2018/2019), General Manager, Hedgerow Farms Inc. 

Jeff Wilcox (2018/2019) Managing Ecologist, Sonoma Mountain Ranch Preservation Foundation

Board Alternate Members-at-Large

Robert Evans (2018/2019) Soil Conservationist, USDA NRCS Fresno

Kristina Wolf (2019/2020) H.T. Harvey & Associates


Diana Jeffery, Administrative Director

Grasslands Journal Editor

Whitney Brim-DeForest

Biographies and Photos

Alphabetical by last name. 

Emily Allen, Workshop Committee Chair

Emily has a deep appreciation for the native grasslands in California and the people who work preserving, restoring and managing them. She is a restoration and botanical consultant based out of Ukiah in Mendocino County and is gaining an appreciation for California natives found in the Coast Range. She is also a board member of the local California Native Plant Society (CNPS) Sanhedrin Chapter. Previously she worked almost 10 years for Hedgerow Farms working to ensure the availability of high quality, locally sourced native seed for revegetation and restoration projects of all sizes and scales.  She obtained her B.S. in Environmental Biology from Westmont College in Santa Barbara, CA and was previously on the CNGA board in 2014-2016 and served as treasurer in 2015 and 2016. She is the current Workshop Committee Chair. (3/2019)


 Jennifer Buck-Diaz, Treasurer
Jennifer is a vegetation ecologist and botanist with the California Native Plant Society where she surveys, classifies, and maps vegetation across California. Her work focuses on the classification and description of grassland vegetation including the study of spatial and temporal dynamics in these systems. She earned both a B.S. and a M.S. degree in Plant Biology from the University of California, Davis where she participated in a state-wide classification project looking at fine-scale vegetation in vernal pools. (10/2017)


 Robert Evans - Alternate Member-at-Large

Bobby has been working in various capacities of conservation, with the Natural Resources Conservation Service (NRCS), for the last 10 years. He graduated from University of Tennessee, Knoxville with a B.S. in Environmental & Soil Sciences with a concentration in soils. He spent the subsequent year in Americorps as an Earthteam Volunteer for NRCS. He then became a Soil Conservation District (SCD) employee in Southeast Tennessee, working in NRCS offices over a period of nearly 2 years. These two positions exposed Bobby to native warm season grasses and their myriad of benefits to wildlife, grazing, and environmental benefits. As an SCD employee, Bobby oversaw renting out, setting, and calibrating grass seed drills, one of which was specialized for natives. He also gained hands-on experience with prescribed burns on native grasses. When Bobby was hired on to NRCS in Fresno, California in 2012, he brought his passion for rangeland, prescribed fire and native grasses with him. Bobby is now the lead rangeland and forestry planner in Fresno County, and is working with multiple landowners on promoting and establishing native grasses on private lands. Bobby joined the CNGA board in 2016 and has enjoyed editing for and contributing to Grasslands. (11/12/2019)

   Christopher Gardner, Outreach & Development Committee Chair

I am the Open Space Land Manager for the City of Davis. I also have experience in conservation policy and organizational development on a statewide level, as well as 10 years in the field as a restoration technician, then project manager around Northern California.  My Bachelor's Degree in Environmental Studies and Master’s Degree in Public Policy and Administration are both from Sacramento State. I am passionate about the work I do and for the conservation of our native grasslands.  I look forward for the opportunity to serve this great organization in several ways, including policy making in grassland conservation on a statewide level with the Conservation Committee.  I also understand the importance of organizational development and bring professional experience working to help the organization on the Development and Outreach Committee. 


Michele Hammond, Member-at-Large

Michele is the Botanist for the East Bay Regional Park District (EBRPD) and currently assesses rare plant communities and practices vegetation management for parkland in Alameda and Contra Costa counties. She maps and manages rare plants including the introduced Santa Cruz tarplant, Holocarpha macradenia, in Wildcat Canyon Regional Park as well as newly acquired parkland within the East Contra Costa Habitat Conservation Plan. Michele earned a B.A. and M.S. in Environmental Science from U.C. Berkeley. (10/2017)

   Jim Hanson, Conservation & Advocacy Committee Chair


Diana (Immel) Jeffery, Administrative Director

Diana served two terms on the CNGA Board of Directors as chairman of the Education & Information Committee before taking over as Administrative Director in July 2016. She has worked closely with USFW on reintroduction projects with the federally endangered grassland plant, showy Indian clover (Trifolium amoenum). She is co- author of the Sonoma Marin Coastal Grasslands Working Groups's “California’s Coastal Prairies” website (http://www.sonoma.edu/preserves/prairie).  She received a B.A. in Environmental Studies from Sonoma State University and a Ph.D. in Ecology from the University of California, Davis.

Richard King, Member-at-Large

I have 36 years of experience in USDA-NRCS as a rangeland management specialist (and biologist) assisting landowners before retiring. I worked in Flagstaff, Arizona, for eight years and subsequently throughout northern California since 1982.

I am a member of the Society for Range Management and strive to help the range profession shed its old paradigms because I know that rangeland health in California’s “annual” grasslands can be greatly improved. I believe: (1) that we underestimate how “native” perennial species on “annual” grasslands can be increased by mimicking the natural processes in which the perennial species evolved, (2) our “invasive species” are typically a symptom of biodiversity loss from past or current management,  (3) planning livestock use based on perennial species vigor and reproduction remains the most misunderstood and underutilized tool for grassland management and “restoration”.

Since 1991, I have enjoyed raising grass-fattened beef, building biodiversity above and below ground, and watching “native” perennial grassland species increase on 40 acres that were part of my great-grandparents’ farm.  I’m excited that genuine shifts in long-held paradigms are steadily occurring in California as people become better observers of what’s happening on the land and how livestock can be used to improve soils, land health, and wildlife productivity.

I’m a Certified Rangeland Manager with the California State Board of Forestry and Fire Protection and the Society for Range Management.  I’m also a Certified Holistic Management Educator with both Holistic Management International and the Savory Institute.  My passion is helping others learn this new framework for decision-making that will simultaneously address the complexity of managing land, people, and money successfully, both short-term and long-term. (10/2017)

   Billy Krimmel, Member-at-Large

Owner, Miridae (formerly Restoration Landscaping Company)

Billy studied plant-insect ecology while completing his undergraduate degree at Brown University, his PhD at UC Davis and post-doctoral research at the University of Arizona. His research focuses on ecological and evolutionary interactions between plants and insects, particularly as they relate to plant defense and plant trait evolution.

During his PhD Billy became increasingly interested in science outreach and native species restoration, and started a landscaping company with the goal of restoring urban and suburban areas while telling the intriguing stories about native plants and animals that share millions of years of evolution. Billy quit his post-doctoral position at the University of Arizona in May 2015 to run the company full-time. The company, Restoration Landscaping Company, is based in Sacramento with a wide range from the foothills to the Bay, and currently employs about 10 full-time ecologically-minded landscapers.

As cities and suburbs continue to grow, the front for native species conservation may be in human-dominated ecosystems, which account for the vast majority of land use in the lower 48 states. The movement to push people to reimagine the front yard aesthetic – which CNGA has been a key regional player in – is a critical piece of this new conservation movement. Plants can be more than decorations, and people’s yards are part of urban ecosystems that need help.

Billy’s experience explaining the value of native species to clients and companies has provided him insight into how to make the case for natives, and how to explain to people from outside of science why they are so special and worth investing in. He also brings on-the-ground experience after more than two years of running his landscaping business and is excited to be a part of CNGA’s efforts to broaden its impact on pushing native landscaping that create habitat, through workshop series and other outreach efforts. Billy is thrilled to serve on the board of directors. (11/16/17)

  JP Marié, Vice-President
JP is the Manager of the U.C. Davis Putah Creek Riparian Reserve where he is in charge of the day-to-day management and operations of the Reserve. With 20 years of experience in land restoration, land management, erosion control, native grassland implementation and invasive plant control, he has an extensive knowledge of native grassland restoration techniques and vegetation management. JP is the Chair of the CNGA Workshop Committee and has been serving on the CNGA Board for seven years. 


Kendra Moseley, Education & Information Committee Chair

Kendra is a Certified Range Manager (CRM) #120 on California forested rangelands and the Western Regional Ecologist for the Soil and Plant Science Division of the NRCS in charge of the ecological site program.  She has over 15 years of experience working with native plants, native plant ecology, conservation and restoration.  She got her B.S. in Rangeland Ecology and Management (RE&M) with minors in Botany and Biology, and her and M.S. in RE&M with an emphasis on Restoration Ecology both from University of Idaho.  Her M.S. project focused on developing a training module for Idaho Transportation Department (ITD) employees on the value and practice of using multiple functional groups of native plants and soil amendments to improve roadside revegetation across the State, as well as finishing the ITD Roadside Revegetation Handbook, continuing their research on using nurse crops to assist native plant establishment in roadside seedings, and native plant germination trials to identify best/cost-effective species for seeding success on roadsides.  After graduating, she got a job as Research Faculty at University of Nevada-Reno in the Plant Ecology Department working on a 4-state native plant restoration project in cheatgrass-infested sagebrush grasslands.  In 2005, she joined NRCS as a field Ecological Site Specialist specializing in rangeland systems and has been with NRCS working on ecological sites ever since.  She served as the CA State Rangeland Ecologist for CA NRCS from 2007-2010, which required running the ecological site and Rangeland NRI programs and moved over to the NRCS Soils Division in January of 2011 as the West Region Ecological Site Specialist in charge of the ecological site work across Alaska, Washington, Oregon, Idaho, most of Nevada and California (excluding the deserts) and all of the Pacific Basin.

It is now her job at the NRCS to provide leadership and policy development support, guidance and training on ecological sites, which includes resistance and resilience ecology, State-and-Transition theory, landscape ecology, rangeland/riparian/wetland ecology and conservation, and ecological site theory and concept and description development. This includes time working in collaboration with outside agency partners and other land management and environmental stakeholders to coordinate efforts and provide training and guidance regarding ecological sites and soil-site relationships when they are interested in pursuing ES efforts.  Kendra has dedicated most of her career to ecological sites because she believes that having a better understanding of the patterns and relationships that exist between soil and site characteristics and how they drive vegetation expression and their ecological dynamics is crucial to the success of all land management objectives, including the conservation and preservation of important and continuously threatened ecosystems like California native grasslands. (1/14/19)

   Felix Ratcliff, Member-at-Large

I am a rangeland ecologist broadly interested in the processes that influence plant and animal communities, and in how management decisions can affect conservation outcomes on rangelands. My research focuses on riparian and grassland vegetation and wildlife dynamics, and the effects of cattle grazing on these systems. In my work I collaborate with land managers, public agencies, and park districts in California to produce data that’s relevant to conservation and management. I completed my PhD at UC Berkeley with Dr. James Bartolome in the Rangeland Ecology Lab in 2017. I’m now a postdoctoral scholar in Dr. Luke Macaulay’s lab at UC Berkeley, where I continue to investigate the impacts of rangeland management on vegetation and wildlife. Before starting graduate school, I worked for five years at a biological consulting firm in the Bay Area.

 Patrick  Reynolds, Member-at-Large
I am the General Manager of Hedgerow Farms where I manage the daily operations of Hedgerow Farms’ business processes. My work includes implementing corporate strategy, ensuring quality customer service and managing the processes and procedures associated with supplying native seed for habitat restoration projects.  As a restoration ecologist with more than 25 years of professional experience in habitat restoration, I utilize my habitat restoration and management expertise to ensure Hedgerow Farms’ mission of growing and selling high quality native local ecotype seed, plugs and straw is fulfilled. As a member of the Yolo County Planning Commission I use my knowledge of Yolo County and its biological resources to evaluate proposed projects under the purview of the Yolo County General Plan.

   Dina Robertson, Research & Science Committee Chair


 Jodie Sheffield, Secretary

I am currently the facilitator in charge of Research & Development for Delta Bluegrass Company located in Stockton, California. With over 25 years of experience in the Turfgrass Industry, I have worked with plant breeders, seed producers and research facilities throughout California and the Pacific Northwest developing premium quality turfgrass sod. Working towards creating awareness of the vital importance of climate appropriate landscaping, I am enthusiastically spreading the word about the use of California native grasses.  I was a presenter at the Sunset Magazine’s Celebration Weekend Event in 2014 and the PG & E Water Conservation Showcase in 2015.  I am also a frequent presenter at Bay-Friendly, Co-Operative Extension Master Gardener Meetings and other industry events and workshops.  

 Jeff Wilcox, Member-at-Large

Jeff Wilcox is the Managing Ecologist for the Sonoma Mountain Ranch Preservation Foundation, primarily responsible for management of the Foundation’s Mitsui Ranch near Petaluma. Much of his professional experience is in the ecological management and stewardship of large tracts of rangelands. He designs and implements programs such as annual use of prescribed fire and seasonal grazing for the purpose of encouraging re-colonization of native amphibians and plants, primarily native perennial grasses. His research and observations have been published in eight national and international peer-reviewed journals. Jeff graduated from UC Davis with a B.S. in Resource Sciences. (10/2017)


 Andrea Williams, President

Director of Plant Science for the California Native Plant Society

Andrea began her work in grasslands in college, with three seasons of monitoring and helping set up an experiment on Cascade Head in Oregon. She has spent portions of the past 20 years on grassland monitoring and restoration projects on National Park Service and other public lands in Northern California and the SF Bay Area. She is best known for her work on plant identification, land health metrics, mapping, and prioritization, and is the current President of CNGA. (11/12/19)


Kristina Wolf, Grasslands Committee, Chair, Grasslands Editor, Alternate Member-at-Large

Kristina has almost 20 years of combined supervisory, research, and practical experience in business management, agricultural lands’ resource management and reporting, inventory and status, wildlife monitoring, water quality planning, soils and erosion control, and adaptive management and decision-making processes. She is a restoration ecologist with H.T. Harvey & Associates in Sacramento, and previously worked as a researcher at U.C. Davis, collaborating with scientists and land managers around the globe to investigate sustainable agricultural and natural resource management practices to reduce pesticide use, improve soil health and quality, increase yields, conserve water, and enhance ecosystems services derived from working landscapes. Kristina completed a PhD in Ecology with a focus in agro-, rangeland, and restoration ecology at U.C. Davis, and has advanced degrees in Animal Science and Soil Science from Cal Poly, SLO. She works in complex agricultural systems in which plants, soils, animals (livestock and wildlife), and the humans that manage these systems interact in the changing and dynamic climate of arid and semi-arid Mediterranean ecosystems. Her work includes natural, manipulative, and social experiments and resource management in natural and working ecosystems, and includes assessing and management of interacting variables in rangelands, riparian areas, and croplands, including soil chemical and physical properties, plant community structure and composition, wildlife diversity and abundance, livestock management (e.g., species, stocking rates, timing, behavior), and human management frameworks, on public and private lands in collaboration with other researchers, agencies, farmers, ranchers, and other managers.

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