Hal Rosner has been the co-host of The Plant a Trillion Trees since its founding in 2020. Hal brought his decades of knowledge 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 future endeavors here and around the world as he continues to share his amazing energy through his Mindfulness Practice and tree knowledge to his local community through Tree Tenders®.

We know that our paths will cross again as he makes the new changes in his life. 

Good Luck and All the Best, Eva Monheim and Andrew Monheim at AndromiDen Recordings.

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 first Community Tree Specialist at Pennsylvania DCNR’s Urban and Community Forestry Program. She helps shape this growing program to better serve communities by building trust, identifying opportunities, and finding creative solutions to challenges. 

She works with municipalities and non-profits to increase tree benefits, manage costs and risks, and creates green spaces that suit people’s needs.

She is a member of the Pennsylvania Landscape and Nursery Association and is in the group that is working on updating the PA Certified Horticulturist study manual.

Orsi has taught gardening and tree care for diverse audiences, including workforce development programs.  Many local parks have benefited from her technical assistance and plant donations.

She created a tree inventory and installed hundreds ofbotanical signs at Merion Botanical Park as a pro bono contribution to her own community. Her “Responsible Gardening” Facebook group helps local gardeners connect and share sustainable, evidence-based practices.

When not in the garden or a park, she enjoys teaching tricks to her border collie or is on the dance floor practicing ballroom and Latin dancing.

Trinity Pierce is the Chicago Region Trees Initiative senior stewardship manager at The Morton Arboretum. She collaborates with community organizations and members to increase 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 Landscape Architecture from the University of Michigan with a background in history, ecological restoration, and urban green space reconciliation.