Staff & Board of Directors

Staff and Board of Directors:


Jay Yankey, District Manager

Linda Dunn, Administrative Assistant

Nicole Slazinski, Conservation Specialist

Mike Miller, Conservation Specialist

Duane Mohr, Conservation Technician

Veronica Tangiri, Water Quality Programs/Adopt-A-Stream Coordinator 

Jessica McCaulley, Water Quality Monitoring Assistant

Alice Markiewicz, Education & Outreach Specialist

Board Members:

Jim Gehlsen, Chairman

Will Lintner, Vice Chairman

Mansimran Kahlon, Treasurer
Thomas Bolles, Director, Virginia Cooperative Extension Agent

Tiziana Bottino, Director

Associate Directors:

Steve Danziger

Clay Morris

Harrison Glasgow


Jay Yankey, District Manager
Jay returned to the District in October 2011 after serving as the Education and Conservation Specialist from February 2002 through March 2005. Jay brings his expertise in agriculture production and natural resources conservation to the traditional farmers, small acreage/specialty crop producers, exotic livestock and horse operations.

Jay is a Prince William County native, growing up on the family farm in Nokesville. His family raised cattle, grain, and hay as part-time farmers. Jay graduated from Brentsville District High School and received his B.S. in Agribusiness and Environmental Science from Ferrum College. Jay is an active member of the Virginia Farm Bureau, and currently serves on the Prince William/Fairfax Farm Bureau Board of Directors. Jay has chaired the Virginia Farm Bureau Young Farmers Committee.

Jay, his wife, Sonja and daughters Ali and Beth, and son Carter, own and operate Yankey Farms, a Community Supported Agriculture vegetable farm and market in Nokesville.


Linda Dunn, Administrative Assistant
Originally hailing from Upstate NY, Linda recently relocated from Frederick MD to Haymarket. Linda quickly rose to the top of the massive resume pile. She’s very happy to be a part of our team and is looking forward to learning more about the district. She enjoys playing golf, tennis and enjoying nature while hiking and biking.


Nicole (Ethier) Slazinski, Conservation Specialist
Nicole joined the District in September, 2006. Nicole earned her Bachelor of Science in Integrated Science and Technology from James Madison University. Her work with the District includes technical assistance to local farmers and horse owners by providing them with environmentally sensitive, efficient, affordable and practical methods in managing their operations. She also organizes educational seminars on topics such as Rain Barrel Workshops, Healthy Horses and a Healthier Chesapeake Bay, Guide to Setting up a Horse Farm, and other agriculture related seminars for county and area residents. Nicole also works on this website. :O

Nicole lives in Sterling with her husband, Chris, and 2 cats.


Mike Miller, Conservation Specialist
Mike joined the District in November 2014. He is a Michigan native with a solid background and knowledge of both natural and agricultural systems. He earned his bachelor's degree from Goshen College with a concentration in Resource Management in 2011. He also holds certifications for herbicide application, wetland delineation, and prescribed burning.

Prior to joining our team Mike worked as a restoration biologist with Blue Heron Ministries, a small restoration company located in Northern Indiana that focuses primarily on early successional ecosystems. Mike worked for the University of Notre Dame as an aquatic research technician focusing on aquatic invasive species in the Midwest.

Prior to earning his degree, he worked for many years in the RV industry, which gave him a vast understanding of construction principles. Mike has volunteered with other conservation districts on multiple projects. In July 2014 he was awarded in special recognition by the St. Joseph County Conservation District, in Centreville, MI, for his efforts as river cleanup coordinator for the county's 150 miles of navigable waterways, along with other programs in which he participated. Mike has received his certification in Nutrient Management Planning, Revised Universal Loss Equation II, and Virginia Conservation Assistance Program. Mike, his wife, and son live in Leesburg.


Duane Mohr, Conservation Technician
Duane has been volunteering with the Prince William SWCD since September 2017. He had volunteered more than 500 hours, working with county citizens on urban and suburban storm water management, conservation planning, nutrient management, grazing management, and youth education programs. Duane was recognized at the Virginia Association of Soil & Water Conservation Districts 2018 Annual Meeting as the state's Earth Team Volunteer of the Year. He also won the NRCS 2018 National (and Southeast Region) Earth Team Individual Volunteer Award.

As of July 2019, Duane has joined the team as a Conservation Technician He currently lives in Nokesville with his wife and 1 Horse and 8 Sheep.


Veronica Tangiri, Water Quality Programs Coordinator
Veronica joined us as a staff member in February 2016. She is a Certified Save Our Streams Program Manager for biological citizen water monitoring in Prince William County.

Born and raised in Cameroon, Veronica has always had a keen interest in the earth's natural beauty. She wrote articles for environmental awareness-raising, and amongst them was "Empower the woman and save the environment". She later received a graduate program admission in Sweden where she pursued environmental sciences, and later on she began exploring the Geographic Information System (GIS) as a vital tool for the environment. When her family immigrated to the United States, Veronica joined them in Virginia in 2009.

Veronica believes the environment is a web and looks forward to learning even more about the connections through physical/data analyses and tools like the GIS. She has a certificate in Disasters and Ecosystems: Resilience in a Changing Climate by the United Nation Environmental Program and Python Programming certificate from George Mason University. She is working on her master's research in GIS Ecosystem Analysis at the Lund University. She has a Master's Degree in Environmental Sciences from the Mid-Sweden University, GIS Certificate from Umea University, and a Bachelor of Science in Geology (major) and a minor in Biology from the University of Buea in Cameroon.

Veronica worked as a team leader intern in natural resources management for the National Park Service at Prince William Forest Park. She also worked as a volunteer for the Smithsonian Conservation Biology Institute in Front Royal, Environmental Services of Arlington County, and the Natural Resources Management of Fairfax County Parks Authority. As a certified stream monitor she helps with the Northern Virginia Soil and Water Conservation District. She is a certified Virginia Master Naturalist, a board member of the Prince William Wildflower Society. She is also a member of the Student Conservation Association/AmeriCorps, Society for Conservation GIS and the Ecological Society of America (ESA). She received a certificate for Community Stream Stewardship from Prince William Conservation Alliance (PWCA) and holds a Stadia Board Society honors from the National Map Corps of the United States Geological Survey (USGS).


Jessica McCaulley, Water Quality Monitoring Assistant

Jessica joined the staff in October 2020, after volunteering with the District as a Water Quality Monitor since 2016. She grew up in Manassas and then moved to southern Virginia to attend college. Jessica has a Bachelor’s Degree in Sociology from Radford University, and a Master’s Degree in Agricultural and Life Sciences from Virginia Tech. After college, she worked as an AmeriCorps member at a non-profit called Beans and Rice, Inc. Her lifelong interest in the outdoors landed her a job at Blacksburg Parks and Recreation, taking people rock climbing in West Virginia, and white-water rafting on the New River.

​Jessica began Water Quality Monitoring while working on Evergreen Acres Organic Farm, owned and operated by Jim Gehlsen, the Vice Chairman of the District’s Board of Directors. Jim introduced her to the District staff members and encouraged her to become a certified Water Quality Monitor, as well as a volunteer for Farm Field Days, MWEE, and the Farm-to-Table Fundraisers.

After working on the farm, she worked as a Naturalist at Huntley Meadows Park where she earned the Interpretive Guide Certification and led programs about wetlands ecology, environmental conservation, and more. Currently, Jessica is a Master Gardener Intern through the Virginia Cooperative Extension in Prince William County. Her goals as a Master Gardener Intern are to teach students hands-on, agricultural education and to spend as much time as possible in the Teaching Garden.

​As a Water Quality Assistant, Jessica hopes to serve the community and work with others to keep our waterways clean and healthy.

She lives in Manassas with her husband and son, along with their rescue pup, Quill.


Alice Markiewicz, Education Specialist
Alice joined us in February 2016 to administer our Environmental Science and Natural Resources Conservation Capsule Program. Alice volunteered in our Education Department from October 2015 to February 2016.

Growing up on Long Island, Alice always had a great love for animals and nature. She was the president of her high school ecology club. Her strong interest in nature, science, and animals led Alice to receive her associates' degree in agriculture. She worked in a duck hatchery for a few years before starting a family. Later she worked in the commercial textile industry for twenty plus years, leaving a few years ago to work from home and support her husband in his career. Accepting the opportunity to work with the District has brought her full circle.

Alice has been a resident of Prince William County since 2002. She is an avid  spinner and weaver, spending a good deal of her free time with local fiber groups. She lives in Manassas with her husband and youngest son.


Jim Gehlsen, Vice Chairman
Jim joined the District as the appointed Director in February 2012.  He has served as treasurer, chairman and now Vice Chariman.  He was elected Area II Chairman in December 2016. He earned his B.S. in Building Construction from Clemson University.  He and his wife, Jean, raised their 5 children on a 100 acre farm in Nokesville he bought in 1983 and named Evergreen Acres.  He planted his first christmas trees in March, 1984 and has been selling them since 1991.  He also grows hay and pumpkins.  Jim operated as a masonry contractor from 1979 to 2010 and still maintains his class A contracto'rs license.  He grew certified organic produce from 2010 to 2017 and was the first grower in PW county to be certified organic and GAP certified.  In 2017 he began construction of Cedar Run Brewery on his farm.

Jim serves on all District Committees and is our Alternate Representative to the Potomac Watershed Council and Roundtable. Jim serves as the Vice Chairman of our 501(C)3 non-profit organization affiiliate, Prince William Environmental Excellence Foundation.


Will Lintner, Vice Chair

Will joined the Board as an elected member on January 1, 2020. He and his wife are long time residents of Prince William County, both graduated from Woodbridge Senior High School. They raised two daughters here.  Mr. Lintner has a B.A. degree in Biology from George Mason University and a B.S. degree in Mechanical Engineering from George Washington University. His desire for safeguarding the environment, especially the quality and quantity of the water within the aquifers, streams and the Potomac River that are a crucial to the residents and wildlife led him to seek office as a director.

Before becoming a Prince William Soil and Water Conservation District Director, Mr. Lintner was employed as an engineer, technical expert and project/program manager by the Federal Government. During his career he worked in the areas of energy efficiency of buildings, adoption of renewable energy, industrial water treatment, water and steam system efficiency, heating and power plant operations, and environmental clean-up.  He provided policy guidance, training, financial assistance and technical expertise to the Federal agencies to assist them in meeting their Federal goals in many of those areas while reducing operational costs. He also collaborated with private companies owning energy intensive laboratories and data centers to assist them with reducing costs through the adoption of best practices that increase the efficient use of energy. Mr. Lintner was the Vice Chairman of the Northern Virginia Section of the American Society of Mechanical Engineers for many years concurrent with his Federal employment.

Mansimran Kahlon, Treasurer
Information Pending


Thomas Bolles, Director


Thomas is the Agriculture Extension Agent in Prince William County. His interests include agricultural and environmental education for adults and children, aquaculture and hydroponics and food security/sovereignty/ justice. Thomas is a certified urban nutrient management planner and is trained in facilitation.  In the past, he has been to Afghanistan twice to work on agricultural development. He also taught in public schools for 13 years. Thomas earned a bachelor’s degree in History from Virginia Commonwealth University and a master’s in Agriculture and Extension Education.


Tiziana Bottino, Director
Information Pending

Associate Directors

Steve Danziger
Steve served on the District Board for 14 years. Steve is a Senior Program Manager of Technology Diversification for BAE Systems in Manassas and the former Director of Operations for Micron Technology in Manassas. Steve has a BS in Physics from Queens College, City University of New York and a MS in Physics from Pennsylvania State University. Steve is a member of Virginia Joint Commission Science and Technology (Nanotechnology), the Prince William Service Authority Board of Directors, Didlake Foundation Executive Board, and the IEEE Science/Technology Public Policy Subcommittee. He is a former member of the Prince William Park Authority, member of United Way of American's Public Policy Board, President of United Way of Virginia, Chairman of Prince William United Way Executive Board. Steve holds over thirty patents and co-authored publications on technical and management topics. He enjoys swimming, tennis, reading and travel. Steve is married and lives in Bristow.


Clay Morris
Information Pending


Harrison Glasgow
Harry comes to us from Fairfax County. He has served the Northern Virginia Soil & Water Conservation District since 2005. He is a member of the Fairfax County Park Authority board from 2005 through 2012. He is a member of the Fairfax Chesapeake Bay Exceptions Committee 2003-2012, and the Fairfax County Tree Commission member since 2006 and serves as chair since 2008.

Harry is a member of the Friends of Huntley Meadows Park, 1990 to present; member of Fairfax County "Friends" Groups: Hidden Oaks Nature Center, Meadowood Farms, Archeology, Riverbend Nature Center, and Lake Accotink Park. He received the Fairfax County "Lord Fairfax Award" in 1993, the Fairfax County Federation of Citizen Association's "Citizen of Merit Award" in 2009, and is a member of the Prince William Conservation Alliance 2009 to present, and Chair of the Alliance Conservation Committee.

Harry was born and raised in Northern Illinois, educated in Illinois public schools and the University of Illinois. He served three years in the U. S. Army, joined the faculty of the U. S. Army Intelligence School at Ft. Devens, MA in 1966 as a civilian instructor. While living in MA he became increasingly interested in conservation matters and projects. He became a volunteer naturalist with the Mass. Audubon Society. He chaired his community's Wetland Conservation Commission which administers the state Wetlands Preservation laws. In 1989 he relocated in Northern VA working as an analyst with the Army's Intelligence Agency. He retired from Federal Service in 2001 and since then has devoted his time volunteering for conservation of his community's natural resources.

Harry states "I can think of nothing quite so simple to understand as the need to conserve the resources of our planet. If for no other reason than the health and well being of our family and ourselves, we should devote what is necessary to this end. The Soil and Water Conservation District program is one of the few direct 'cause and effect' organizations that aims exclusively for that goal. My experience with the Northern Virginia SWCD has been one of the most satisfying volunteer pursuits I have had. The Prince William SWCD offers another facet of that experience that I would like to explore." Harry serves the District on the Education, Technical Review and Finance Committees, and chairs the Districts Prince William Environmental Excellence Foundation, a 501(C)3 non-profit organization. Harry is an enthusiastic participant with our Farm Field Days, Arbor Day, Meaningful Watershed Educational Experiences for third grade students, and science fair events.

Freedom of Information Actl
Rights of Requesters and the Responsibilities of the Prince William Soil and Water Conservation District under the Virginia Freedom of Information Act: The Virginia Freedom of Information Act (FOIA), located § 2.2-3700 et. seq. of the Code of Virginia, guarantees citizens of the Commonwealth and representatives of the media access to public records held by public bodies, public officials, and public employees.
To request records from our District, direct your request to the FOIA Officer, Jay Yankey. He can be reached at 8850 Rixlew Lane, Manassas, VA 20109, phone (571) 379-7514, email


Prince William Soil & Water Conservation District, 8850 Rixlew Lane, Manassas, VA 20109

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