Tom Smarr is the Executive Director at Jenkins Arboretum & Gardens in Devon, Pennsylvania. He holds a Bachelor of Science degree in Environmental Studies from the Slippery Rock University of Pennsylvania and a Master’s degree in Urban Horticulture Studies from the University of Washington in Seattle. He has worked for established institutions such as the University of Washington Botanic Gardens in Seattle and the Native Plant Trusts’ botanical garden “Garden in the Woods” in Massachusetts. Tom’s most notable work has been leading horticulture at newly opened urban parks such as the Rose Fitzgerald Kennedy Greenway in Boston; the High Line in New York City; and The Parklands of Floyds Fork in Louisville, Kentucky.

About Jenkins Arboretum
Jenkins Arboretum & Gardens is one of the region’s great horticultural and environmental botanical garden assets, encompassing 48 acres, over a mile of trails, and a diverse plant collection that is specialized in Eastern North American Native plants, plus rhododendrons and azaleas from around world.

Jenkins is located in Devon, Pennsylvania and is open every day of the year and always has free admission.

Kristin Biddle is a horticulturalist, Trustee, and Chair of the Horticultural Committee at Andalusia Historic House, Gardens and Arboretum. Biddle earned a degree in Horticulture from Temple University, Ambler, Pennsylvania, and brought her passion for gardening to several public gardens, including The Brooklyn Botanic Garden, Wave Hill, The Mt. Cuba Center, and Historic Bartram’s Garden. She then served as a trustee on the boards of The Mt. Cuba Center, Bartram’s Garden, and The Ambler Arboretum. Biddle has worked at Andalusia since 2005 and focuses on maintaining its historic gardens, manages the Garden Volunteer Program, and sometimes gets to garden.

Merissa MacDonald is a Certified Arborist through the International Society of Arboriculture and the Southwest Tree Program Coordinator at Bartram's Garden, in Philadelphia, Pennsylvania. In her work, she leads a cohort of high school urban foresters and encourages them to explore green Industry jobs from arborist to landscape architect and any job in between.

Her work also includes community organizing around tree plantings in collaboration with partners at PHS (the Pennsylvania Horticultural Society). The goal is to increase the current 8% tree coverage rate of Southwest Philadelphia, with a focus on the neighborhood just outside Bartram’s Garden.

Merissa has a passion for landscape design and community planning and incorporates the two into her urban forestry curriculum.

Sara Street is the green guru of First Community Foundation Partnership of Pennsylvania. As the manager of Williamsport’s local nature preserve, Rider Park, she fills the roles of forest ecologist, wildlife biologist, environmental educator, working maintenance foreman, volunteer coordinator and more.

With degrees in landscape architecture, ecological restoration, park management, and landscape technology, Sara brings a wealth of knowledge and experience to her role. As the steward of nearly 900 acres, she is responsible for encouraging forest health and longevity, managing invasive plants and pests (like spongey moth and hemlock elongate scale) and planting native plants to enhance the park’s biodiversity. She encourages wildlife habitat by encouraging landscape types that aren’t present at Rider Park (like a shrub dominated savanna on the edges of the forest and meadows). Sara also maintains trails, coordinates volunteers, and shares her passion for nature and wildlife with visitors.

Even when she’s not on the job, Sara spends a lot of time outside—hiking, gardening, swimming in the West Branch of the Susquehanna and Loyalsock creeks and attending soccer events with her son.

“I lived and worked in northwest Washington state, and the trees there are very impressive in stature, height, and density. But the range of species pales in comparison to the richness of North Central Pennsylvania. I adore walking through the forest, looking at patterns and identifying trees!”

Rebecca Johnson is an ISA Certified Arborist and a true arborholic. She is addicted to helping trees and the people who care for them. Rebecca regularly provides education to fellow arborists and the general public. She serves on the Board of Directors for the Texas Chapter of ISA as its president and is a private consulting arborist, teaching homeowners about proper tree care. Rebecca has been involved with the Certified Arborist prep courses since 2011 and was part of the cadre responsible for bringing the Certified Arborist prep class to Austin, Texas in 2015. She currently coordinates the Austin class.

Rebecca was recognized with the 2020 ISA President's Award for her work with Women in Arboriculture. She is a TCIA Certified Treecare Safety Professional, Tree Risk Assessment Qualified, and holds the Texas ISA Oak Wilt and Wildfire Risk Reduction qualifications, and has a degree in Forestry from Oklahoma State University. She spends her free time looking at and admiring trees and spends quality time with her family and pets.

Ethan Olson is the owner of Walburn Run Nursery located in Brockway, Pennsylvania. His main plant focus at his nursery is on fruit and nut trees along with berried shrubs and edible herbaceous plants. Presently, Ethan spends the majority of time growing and collecting the American chestnut (Castanea dentata). His mission is the preservation of a diverse chestnut germplasm in hopes of getting this once great species back into the environment as a productive component to the northeastern forest ecosystem. Ethan has a bachelor’s degree in landscape architecture from Temple University and is an avid outdoorsman.

With more than 14 years in the horticulture and arboriculture industry, Rob Shaut joined Casey Trees, an Urban Forestry non-profit, in March of 2018. He has contributed to the operational efficiency and the expansion of their scope of work. Thanks to the leadership of Rob, Stormwater Low Impact Development and Best Management Practices are now an integral part of the Casey Trees portfolio, along with tree installation, pruning, and maintenance. Previously, Rob completed the two-year Professional Horticulture Program at Longwood Gardens in Pennsylvania, studied at the Royal Botanic Garden Edinburgh, and received a Bachelor of Science from Clemson University in business management. He spent five years working as a project manager and garden designer for Shimizu Landscape Design, a Maryland-based design and build firm. He worked for two years as a project manager for Cotswold Gardens, a design and build firm in West Grove, Pennsylvania. Rob is a certified Arborist and Tree Risk Assessment Qualified. He is currently a member of the MAC-ISA Board of Directors and the TREE Fund Board of Directors. As the Director of Tree Operations at Casey Trees, Rob focuses on increasing canopy coverage, storm water mitigation, heat island mitigation, and phytoremediation. Casey Trees targets lower canopied areas and equity emphasis areas around our nation’s capital.

John Perlin is a Professor and Visiting Scholar in the Department of Physics at University of California, Santa Barbara. He is the author of the newly released edition of A Forest Journey: The Role of Trees in the Fate of Civilization.

Perlin says, “It is my hope that the new edition of A Forest Journey will make clear the imperative humanity faces, because losing our forests would not merely be the end of nature, it could mean the end of us.”

Originally published in 1989, the book’s comprehensive coverage of the major role forests have played in human life …….earned it recognition as a Harvard “Classic in Science and World History” and as one of Harvard’s “One Hundred Great Books.”

In the new edition, Perlin cites data on how humanity has cut down half the trees on the planet in the last 12,000 years, and that deforestation continues at an alarming pace with 15 billion trees removed per year. That’s 500,000 square miles of forested land lost since the first edition of A Forest Journey was released.

Perlin is also the author of three other books: A Golden Thread: 2500 Years of Solar Architecture and Technology; From Space to Earth: The Story of Solar Electricity; and Let It Shine: The 6000-Year Story of Solar Energy.

Perlin lives in Santa Barbara, California.

Sarah C. Low is a business management consultant, ecologist, and educator. Sarah has been a change-maker in municipal governments, federal agencies, and nonprofit organizations. She is the Founder of Tacoma Tree Foundation, an organization formed to help grow a greener, healthier, and more connected Tacoma. Sarah is now the principal and owner of Strategic Nature, LLC, which specializes in helping organizations and individuals make meaningful changes.

Hugh Weldon gained early knowledge of horticulture working on vegetable farms in Ireland – his home country. He earned a horticulture certificate from the practical experience he gained which led him to a supervisory position with a landscape nursery with 30 staff members. He was in the position for 5 years. Hugh then worked as a foreman in a flower and bulb nursery for two years where he continued to broaden his horticulture background.

He emigrated to the U.S., for greater opportunities in the horticulture industry in 1993 and worked with an arborist learning all aspects of tree care, planting, pruning, and removal. With tree experience under his belt, Hugh worked with a company to learn numerous aspects of landscape maintenance of residential and business properties which included snow removal.

In 1995 Hugh applied for a grounds position at Villanova University and continued his education earning a Horticulture Degree from Temple University. After several promotions and numerous years of work, Hugh became the Horticultural Supervisor followed by Horticultural Manager. He can now say he has been happily tending the staff and the landscape at Villanova University for over 27 years.

Mayor Tim Schultz has been a resident of Hatboro for over 20 years. Devoted to his community, Tim has served in the capacity of Borough Historian, a member of the Hatboro Tricentennial Committee, Chairman of the Hatboro Holiday Parade, and the President of the Greater Hatboro Chamber of Commerce.
Mayor Schultz also joined the national Mayors for Monarchs program in 2020 dedicated to improving pollinator survival across America.
Tim is also the proud owner of Bright House Creative Services, LLC, and loves being behind a camera. In addition to his photography business, Tim is a Realtor at Class Harlan Real Estate.
Tim, along with his wife DJ and five children, have a passion for all things Hatboro and have dedicated themselves to improving the Borough in every way possible.
Tim’s strong leadership and devotion to the Hatboro community shines through his work as President of the Greater Hatboro Chamber of Commerce and now as Mayor.

Ashley Miles
Ashley Miles is the Administrative Production Assistant at Ruppert Nurseries and has held other positions such as In-House Salesperson and Inventory Manager. Ashley has been with Ruppert since 2013. She has a Bachelor of Science in Environmental Biology from the SUNY College of Environmental Science and Forestry. Ashley is also a Certified Professional Horticulturalist. Ashley is an enthusiast of the natural world. Trees have inspired her both personally and professionally and she is grateful that trees have been the focus of her career.

Kelly Lewis
Kelly Lewis is the General Manager of Ruppert Nurseries. Kelly was raised in the nursery business working at a family Garden Center from the time he was old enough to be of any help. After a two-year vocational horticulture program in high school, he started working full-time for the family business in a variety of roles and learned the business side of the horticulture industry. After years of traveling the country as a purchaser for the garden center, he decided being a grower was a better fit for the agricultural lifestyle he desired. Starting in 1994 for Ruppert Nurseries, Kelly first worked sales but quickly transitioned to managing the then relatively small tree-growing farm. Since that time, the farm has grown to over 900 acres and planted more than 250,000 trees. Kelly has always been fortunate to be able to attend countless trade shows, seminars, and educational events during his career. Including the first two-year EAGL class (Executive Academy for Growth and Leadership) where he earned a certificate in Applied Horticulture Business from Texas A&M with Dr. Charlie Hall. Kelly has served on the Northern Virginia Nursery and Landscape Association, The Maryland Nursery, Landscape, and Greenhouse Association, Montgomery County Horticultural Advisory Board, and on the Board for Trees for The Future.

Jill Rose is the State Forest Pathologist with the Pennsylvania Department of Conservation and Natural Resources (DCNR) Bureau of Forestry since September 2019. Previously she was the Forest Health Programs Manager and State Forest Pathologist for the West Virginia Department of Agriculture, Plant Industries Division for 17 years.

Jill’s studies included an Associate Degree in Wildlife Technology from Penn State University from the DuBois campus and a Bachelor of Science in Wildlife Sciences from the University of Idaho. Jill also holds a Master of Science degree in Plant Pathology from Washington State University.

Steve Shreiner is the president and founder of Schreiner Tree Care established in 1986. He is a Master Arborist, and Tree Risk Assessment Qualified. Steve has proven success in developing long-standing client and vendor relationships, many of which are twenty-five-plus years strong. He also enjoys working with clients who care about their trees, landscape, and the greater community. Shreiner has served on various local arboreta, environmental education and business boards.

Sir Tim Smit KBE (Knight of the Most Excellent Order of the British Empire) studied Archaeology and Anthropology at Durham University. This began a lifelong passion for regeneration and putting his passion and energy into his work. He has followed his occupations embracing his many interests from Archaeology through music to wreck diving, Rare Breed animal husbandry, and building restoration. In 1990 he ‘discovered’ and then restored ‘The Lost Gardens of Heligan’ with John Nelson and remains a director. Heligan is now one of the UK’s best-loved gardens having been named ‘Garden of the Year’ by BBC Countryfile Awards in March of 2018. Tim’s book The Lost Gardens of Heligan won Book of the Year in 1997.

Today, Tim is Executive Chair and Co-founder of the multi-award-winning Eden Project in Cornwall. Since its opening in 2001, over 23 million people have come to see a once sterile pit, turned into a cradle of life. Eden contains world-class horticulture and startling architecture symbolic of human endeavor and our dependence and unbreakable part in the systems of the natural world.

Nan Sterman is a California native, garden expert, garden designer, author, botanist, and award-winning communicator. Nan has long been dedicated to the transformation of planted landscapes from overly thirsty and resource-intensive to climate appropriate and sustainable.

In addition to designing gardens, Nan works hard to connect plants to people and the planet. Some examples of that work include:

· Her award-winning public TV show, A Growing Passion which Nan hosts, produces, and writes. Forty-eight episodes air on KPBS TV in San Diego, on CREATE TV, and are available online at www.AGrowingPassion.com.

· Nan’s most recent book, Hot Color, Dry Garden, is a guide for creating color-filled, waterwise gardens. She’s written hundreds of articles for newspapers and magazines, too.

· In 2014, Nan founded the San Diego Gardener Facebook group, where more than 16,000 people discuss plants and gardening in Southern California.

· At the beginning of the COVID quarantine, Nan co-founded Grab & Grow Gardens to support food-insecure communities during the COVID-19 crisis and beyond. To date, Grab & Grow Gardens has supplied more than 26,000 starter vegetable gardens for families and seniors in need across the region.

· Nan leads tours to garden adventures around the world, including Europe, South Africa, Costa Rica, and the US.

· In 2022, Nan kicked off the online Garden School, targeted at passionate home gardeners. In addition to a monthly garden membership, Nan teaches online and in-person seed-starting workshops every spring.

Nan’s approach to gardening dates back to the 1970s when she was involved in the first wave of the sustainability movement. She trained at the Integral Urban House in Berkeley, California, earned a botany degree from Duke University, a master’s in biology from UC Santa Barbara, and a master’s in instructional design from San Diego State University.

Prior to delving into the gardening world, Nan created curricula, training programs, and educational materials for Fortune 500 companies, zoos, aquaria, and not-for-profit organizations. Her ability to take complex information and create effective educational programs is one of her greatest strengths, and a major source of her successes.

Anthony Tresselt is a certified arborist, arboricultural safety consultant, trainer, and 30-year student of arboriculture and tree climbing. He is a lead instructor with Arboriculture Canada (ArbCan) Training and Education. As a part of the amazing ArbCan team, he travels, educates, facilitates, and writes helping to spread the word about safe, efficient arboriculture.

Anthony’s mission as an arborist, leader, educator, and human is to have a positive impact of growth and achievement on everyone he interacts with whether in person, through books and articles, or through online media. To quote his mentor and philosophy professor, Dr. R. Ginsburg, “Teaching is the hope I practice.”

He is also a regular contributor to several arboricultural trade magazines and has two works of fiction based on trees and tree climbing novels published, Free Falling: An Arboreal Novel and Fall Factor both can be found on Amazon.

Andrew Bunting is Vice President of Horticulture and leads the utilization of planting and design to promote environmentally sound gardening practices at PHS (Pennsylvania Horticultural Society). Andrew has elevated each of the departments he oversees and has increased the brand and visibility of PHS through their respective work.

Andrew received his Bachelor of Science in Plant and Soil Science from Southern Illinois University. Prior to arriving at PHS, Andrew worked at the Chicago Botanic Garden, Chanticleer Garden, and the Scott Arboretum for a tenure of 27 years. He has received the American Public Gardens Association’s Professional Citation, Chanticleer Scholarship in Professional Development, and the Certificate of Merit from the Pennsylvania Horticultural Society. He also serves on the Board of Magnolia Society International. Andrew published his first book in 2015, The Plant Lover’s Guide to Magnolias.

Andrew enjoys bird watching, travel and, of course, gardening.

Christy Rollinson is the Forest Ecologist at The Morton Arboretum. As a research scientist, much of her work looks at how individual trees, forest communities, and ecosystems respond to changing weather and climate. Christy’s work involves a variety of approaches, including tree rings, phenology and citizen science, and computer modeling. Christy holds a Bachelor of Arts in Biology and Environmental Studies from Oberlin College and Master of Science and Ph.D. degrees in Ecology from Penn State University. At The Morton Arboretum, Christy has been highly involved with science and climate change communication to a variety of professional and non-professional audiences.

Anelle Ammons is an ISA Certified Arborist® and ISA Certified Arborist Utility Specialist®. She has a Bachelor of Science degree in biology from the University of North Carolina at Asheville and a Master of Horticulture Science from North Carolina State University. Anelle works as a contract Utility Arborist and spends her free time gardening, hiking, and writing children's adventure books.