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 responsible for curating, recording, mapping, and labeling a vast array of plant collections, which encompass over 11,500 woody plants and thousands of herbaceous plants. 

She is an ISA Certified Arborist® and the Philadelphia Flower Show Nomenclature Chairman.  Her plant passions include oaks, beeches, Stewartia, conifers, witch-hazels, deciduous azaleas, and ferns, just to name a few.

Matthew Aghai is a climate tech executive with 20 years of professional experience spanning public, private, and academic ventures in reforestation and natural resource management across the globe. 

He currently serves the teams at Mast Reforestation and its subsidiaries, but also enjoys a variety of extracurricular functions including advising and speaking on environmental and sustainability topics, nature based and technological solutions for greenhouse gases (GHG) mitigation, and opportunities to develop durable economic pathways for stewards and skilled workers in the fight against climate change.