Pacific Northwest Invasive Plant Council

   PNW IPC Board Members

Steve Manning, President

Steven Manninghas spent the past 25 years working on invasive species.  He is the current President of the Pacific Northwest Invasive Plant Council current Vice President of the Mid Atlantic Invasive Plant Council, co-chair of the National Military Fish and Wildlife Association’s Invasive Species Working Group and serves on the board of the North Carolina Invasive Plant Council.  He is also the founder and President of Invasive Plant Control, Inc. (IPC)  IPC was created to extend internationally its dedication to the control of invasive species utilizing a revised Integrated Pest Management approach and has successfully controlled hundreds of invasive species for a wide variety of land managers including federal, state, municipal and private landowners throughout the world. 

Mr. Manning also designs and implements multiple training courses and workshops worldwide with topics ranging from “Invasive Species in Ports of Entry” to “On the Ground Control Techniques.”   IPC invests heavily in educational and awareness activities annually and is also heavily involved with local, state and international industry development projects including Volunteer Based Early Detection Networks.  In 2012 IPC introduced a suite of software and web based tools dedicated to environmental needs.  His 2010 publication,   Miller, J.H.: Manning, S.; Enloe, S.F.  2010  “A field guide for the management of invasive plants in southern forests”  was published by the U.S. Department of Agriculture Forest Service, Southern Research Station. (

Sarah Reichard, Vice President

Dr. Sarah Reichard is a Professor at the University of Washington and is Associate Director of its Botanic Garden. Her research is focused on understanding the biology of invasive plants and using that understanding to develop risk assessment methods to prevent their introduction and spread.

Dr. Reichard co-authored a National Academy of Science report "Predicting Invasions of Nonindigenous Plants and Plant Pests." She was co-editor of "Invasive Species in the Pacific Northwest," (University of Washington Press) and author of numerous research papers, she also served six years on the federal Invasive Species Advisory Committee and is on the Invasive Species Specialist Group of the International Union for the Conservation of Nature. Her newest book is The Conscientious Gardener: Cultivating a Garden Ethic (University of California Press). Dr. Reichard founded and directs the Washington Rare Plant Care and Conservation Program, which works with federal, state, and local agencies to protect Washington's rare plant species.

Lizbeth Seebacher, Treasurer

Lizbeth Seebacher has an M.S. and Ph.D. in estuarine and freshwater wetland restoration and invasive species biology. She leads numerous workshops and trainings in invasive species biology and species identification for the general public. She has worked for Sustainable Conservation developing a Plant Risk Assessment model and the Army Corps of Engineers as a Wetland Biologist.

Currently, she works for the Washington State Department of Ecology as a Wetland and Aquatic Biologist where she manages two independent programs on aquatic invasive plants and freshwater algae.  She is a board member for the Society of Wetland Scientist, the Washington Invasive Species Council and the PNW Invasive Plant Council. 

Mandy Tu, Secretary

Mandy Tu, a plant ecologist and botanist, currently working as an independent consultant that specializes in invasive species prevention and management. She is based out of Portland, Oregon and frequently coordinates and teaches invasive species workshops, advises on a variety of weed management and restoration projects, analyzes data and writes technical reports.

She has worked on projects for the Center of Invasive Plant Management and the Department of Defense, the National Wildlife Refuge System, the National Park Service, and the U.S. Forest Service. Previously, Mandy was the organization-wide invasive species technical science specialist at The Nature Conservancy, providing training and reviews of site-based invasive species management plans, weed mapping and monitoring, and advising on pesticide use and biological control releases. Mandy has also worked as adjunct faculty, instructing courses at Portland State University, Washington State University, Vancouver, and at Pacific University. She has a B.S. in Botany from the University of Washington and a Ph.D. in Plant Biology from the University of California at Davis.

Shawna Bautista

Shawna Bautista is currently the Regional Pesticide Use and Invasive Plant Coordinator for the Pacific Northwest Region of the Forest Service in Portland.  She has been with the Forest Service for 26 years. She received her B.S. in Wildlife Management from Humboldt State University and her M.S. in Zoology and Physiology from the University of Wyoming. 

Shawna is a Wildlife Biologist, beginning her career on the Angeles National Forest in southern California.  It was on the Angeles NF that Shawna noticed the devastating effects of Arundo donax on endangered fish and bird habitat, and her passion for managing invasive plants was born. 

Timothy B. Harrington

Timothy B. Harrington received a B.S. degree in botany from LSU and M.S. and Ph.D. degrees in forestry ecology and silviculture from OSU. In the 1980’s, he was a researcher in the forest vegetation management cooperative at OSU. In the 1990’s, Tim was a professor of silviculture at the University of Georgia in Athens. Since 2002, he has worked as a scientist for the PNW Research Station, U.S. Forest Service in Olympia WA.

Tim has authored over 120 publications on topics of silviculture, vegetation management, and forest ecology. His recent work on invasive plant species demonstrates that retaining woody debris after forest harvesting inhibits invasions by Scotch broom and a variety of non-native grasses and forbs.

Bill Brookreson

Bill Brookreson retired after a 32 year career with the Washington State Department of Agriculture where, among other roles, he served as Assistant Director for Plant Services, Assistant Director for Pesticide Management, Assistant Director for Agency Operations and retired after seven years as Deputy Director. Bill holds an Associate of Arts degree from Lower Columbia College, a BA from Western Washington University, and a Master Degree from the University of Illinois where he studied Russian and East European History.

Bill is an active member of the Washington Native Plant Society. With his retirement in 2006, Bill became a Native Plant Steward. In that role, he has put in over 6000 volunteer hours heavily involved in restoration projects at Lakeridege Park in Seattle (Deadhorse Canyon), the Tacoma Nature Center, the Woodland Trail in Olympia, and the Capital Museum Native Plant Garden in Olympia in addition to giving talks on native plants to groups in all three cities. Bill became chair of the South Sound Chapter of WNPS in 2014 and serves on the State Executive Board and Conservation Committee as well as editing the chapter newsletter. Bill has been on the Board of the Pacific Northwest Invasive Plant Council since 2008.

Sam Leininger

Sam is an ecologist and program manager of the Clackamas Soil and Water Conservation District’s WeedWise program.  As program manager, Sam oversees WeedWise operations and provides technical assistance to landowners and to the Clackamas SWCD planning staff. He has a strong focus on invasive species control as well as landowner education and outreach.

Growing up in rural eastern Oregon, Sam learned the importance of responsible land management at a young age. Sam attended Oregon State University and earned an Honors B.S. degree in Environmental Science, and later received a M.S. in Ecology from the University of California, Davis after specializing in invasive species ecology and management.Over the course of his career as an ecologist, Sam has worked on a variety of issues, including prairie restoration, rare plant conservation, production forestry, fish and wildlife habitat enhancement, water quality, population modeling, as well as invasive species management.
Sam is very active in Cooperative Weed Management Areas (CWMA) in Oregon and Washington and serves a leadership role in both the 4-County CWMA and the Columbia Gorge CWMA.  He also serves on the advisory committee to the Oregon Invasive Species Council. Sam lives in Oregon City, OR with his wife and two sons, where he enjoys gardening and spending quality time with his family.