The Plant a Trillion Trees Podcast

Nicole Walker is the author of several books including Howto Plant a Billion Trees: A Memoir of Childhood Trauma and the Healing Power of Nature, Sustainability: A Love Story, and The After – Normal: Brief, Alphabetical Essays on a Changing Planet , along with many other noted titles. She has written several pieces for  The New York Times  and is a recognized author in several editions of  Best Am...

Rob Shaut is the Chief Operating Officer (COO) at Casey Trees a Washington, DC-based non-profit. He was formerly the Tree Operations Director, managing a 30-person team responsible for planting 7,000 plus trees per year, while maintaining thousands more annually throughout Washington, DC, Maryland, and Virginia. Rob also oversees the Casey Tree Farm, Education, Policy and Land Conservation, Develo...

Hal Rosner has been the co-host of The Plant a Trillion Trees Podcast since its founding in 2020. Hal brought his decades ofknowledge in the tree industry to the podcast. He partnered in finding guests, read their books and researched their backgrounds, created questions, and brought his keen wit and sense of humor to the interviews. Hal will be missed but we know that he will be successful in his...

Ashley Beckwith is the founder and CEO of Foray Bioscience, where she and her team leverage plant cell culture to createpredictable access to the plants and plant products the world needs, by growing them from the cell up. Ashley’s path into the world of plants has been a curious one. She holds a Ph. D. in Mechanical Engineering from MIT and hasbeen innovating at the intersection of biology, mater...

Orsolya (Orsi) Lazar is an urban forester, an ISA Certified Arborist and a Pennsylvania (PA) Certified Horticulturalist in Sustainable Landscapes. Her unconventional path to forestry began with a Master’s Degree in Ecology and a Master’s Degree in Molecular and Cell Biology. She has over 20 years of experience in landscape design and management, project management, and education. Orsi became the f...

Jonathan Mullard is a Fellow of the Royal Society of Biology, a Founder Member of the Chartered Institute of Ecology andEnvironmental Management, and a Chartered Town and Country Planner.  He had combined a passion for the naturalenvironment with a career in conservation and spatial planning.  In the early 1980s, Jonathan worked alongside Max Nicholson, the pioneer ornithologist and environmentali...

When you ask Basil Camu what he thinks about himself, he'lltell you he is incredibly lucky. He has family he loves dearly, friends and colleagues who inspire him, and every day he gets to care for trees, soil, and flowers. He pursues his purpose and passions as the co-founder of Leaf & Limb, a tree care company in Raleigh, NC, and Project Pando, a non-profit that aims to connect people to...

Rick Hartlieb and his wife and business partner, Jen, are the proud first-generation farmers behind Castanea Farms in Berks County, Pennsylvania. Their journey is rooted in both passion and persistence, beginning more than 25 years ago when they first met through the Conrad Weiser Area School District’s FFA program. Rick’s early love for forestry led him to Penn State University, where he earned a...

Natalie Carmolli   manages Public Relations for Spring Meadow Nursery and Proven Winners® ColorChoice® shrubs. She grew up in the floral industry and holds a bachelor’s degree in theatrical arts, along with a Certificate of Mastery in tree and shrub identification from Longwood Gardens. An avid gardener and dynamic communicator, Natalie is passionate about sharing her love of gardening with shrubs...

Mary Tipping has held the position of Curator and Plant Recorder at the Scott Arboretum & Gardens at Swarthmore College in Swarthmore, Pennsylvania, since 2015, after working as the Horticulturist at the Henry Schmieder Arboretum of Delaware Valley University in Doylestown, Pennsylvania.  In her current position, she is responsiblefor curating, recording, mapping, and labeling a vast array of...

Ethan Kauffman is the first director of Stoneleigh: anatural garden , where he has led the transition from a private estate to a public garden over the last 8 years. He developed his love of the natural world by exploring the Susquehanna River Hills in Southeastern Pennsylvania. He cultivated his horticultural perspective over two decades of gardening in the Deep South, including as director of Mo...

Trinity Pierce is the Chicago Region Trees Initiative senior stewardship manager at The Morton Arboretum. She collaborates with community organizations and members toincrease awareness and foster action through plantings and ongoing care in order to grow a more diverse, more abundant, and more equitably distributed urban forest. A Certified Arborist, she holds a Master of LandscapeArchitecture fro...

Katherine Mills, General Manager for Munstead Wood, is anexperienced heritage professional with 14 years in the National Trust. Having run some of the charity’s most significant and popular properties, including Nymans, West Sussex, and Polesden Lacey, Surrey, UK; Katherine was responsible for the final purchase and acquisition of Munstead Wood in April 2023.  Since acquiring the property, Katheri...

Jehane Samaha is the National Urban Nursery Specialist with the US Forest Service. She develops trainings and networking for both urban foresters and nursery growers to improve tree stock quality, enhance connectivity in the urban nursery pipeline, and promotes climate-adaptive genetics for urban trees. Jehane is based in Philadelphia, serves on the board of UC (University City) Green, and previou...

Della Fetzer is a biologist and entrepreneur. Her company, Rebel Cultures, partners with foresters, farmers, conservationists, greenhouses, and universities to develop low-cost and biodiversity-conscious propagation solutions for seed-scarce plants, and plants that can't be efficiently propagated from seed by using new approaches to tissue culture.

Jamie Biddle is the founding partner and CEO of VerdisInvestment Management, a single-family office. He sets the strategic direction of the firm, and overseas investment activities, operations, and finance. Jamie is behind portfolio construction, manager sourcing and selection, due diligence,and risk management. He is an active member of the Investment Committee. Jamie brings more than two decades...

Linda Langelo is a Colorado State University Extension Horticulture Specialist and host of the Relentless Gardener Podcast. The five counties under her care are in Northeast Colorado, where she assists homeowners and professionals with horticultural issues. She created a Facebook page titled, Garden the Plains to reach a broader audience with the help of Master Gardeners. The Master Gardener Progr...

Jay Worth started working in the Green Industry in college to earn money between semesters. He started mowing lawns for a landscaping company and then moved to a full-service landscaper. While attending University in Florida, he alsoworked on a palm tree farm and fell in love with the trees.  During the Great Recession in 2009, he was recruited to sell lawn care door-to-door. Having no other job o...

Kevin Zuidervliet is owner and grower at Octoraro Native Plant Nursery, in Kirkwood, Pennsylvania. His diverse professional experience and passion for horticulture began while traveling and working on organic farms in Australia and New Zealand. He leveraged his skills in an AmeriCorps VISTA position managing a community garden. Kevin continued to hone his plant knowledge at Shaffer Landscapes, in...

Bestselling author   Randi Minetor writes for the Birdfinding and Best Easy Bird Guides series for Falcon Guides/Globe Pequot Press and is the author of  Backyard Birding and Butterfly Gardening  for Lyons Press. Her most recent book,  The Complete Language of Birds , is an encyclopedia that unites classic illustrations, science, folklore, and mythology about more than 400 bird species around the...

Angelique Robb graduated from Louisiana State University in Petroleum Engineering, working in the oil industry for many years in the USA and the UK.   In 2008, she qualified as a landscape designer and launched a design and build company, Papillon Designs and Landscaping Ltd in Scotland, UK. Since then she has built up the company into a national award-winning practice. She is passionate about the...

Celine Colbert is Pennsylvania’s Tree Canopy Coordinator, dedicated to enhancing urban forestry and promoting sustainable tree management across the state. As a Board Certified Master Arborist with a background in forestry, Celine collaborates with local governments, organizations, and communities to implement effective tree planting and maintenance programs offering technical assistance, grant ma...

Jessica (J.J.) Käthe is the resiliency planting coordinator within the Climate Forestry & Carbon Unit at NYSDEC (New York State Department of Environmental Conservation). J.J. is seeking input from agencies and organizations across the state for the New York State Reforestation Plan. The plan will act as a roadmap to achieving the Climate Act Scoping Plan goal of establishing 1.7 million acres...

Tim Johnson is the Chief Executive Officer at the Native Plant Trust in Framingham, Massachusetts. He leads the organization’s 45-acre Garden in the Woods in Framingham, Massachusetts; the Nasami Farm, a native plant nursery in Whately, Massachusetts; and the expanded seed-processing and storage facilities to support the new Northeast Seed Network. The Network is a regional initiative led by the N...

Dr. Anna Paltseva is a distinguished urban soil scientist and educator, currently serving as a professor in the Department of Agronomy at Purdue University. She earned her Ph. D. in Earth and Environmental Sciences from the CUNY Graduate Center. Dr. Paltseva’s research focuses on urban soil contamination, particularly heavy metal pollution, and its impact on urban agriculture, ecosystem health, an...