Course Faculty

Mac mentors Threefold Community Farm staff and interns. Mac began farming in 1975, when he had the “privilege and good fortune” to learn biodynamic methods directly from former co-workers of biodynamic pioneer Ehrenfried Pfeiffer at the Fellowship Community. In 2006, Mac became the Program Director of the Pfeiffer Center and is the core instructor of our Practical Training in Biodynamics.

As Farm Manager, Megan coordinates the daily work on our farm, and is an instructor in our One-Year Part-Time Training. She takes a leading role in planning and carrying out our annual Plant Sale and each season’s vegetable production. She directs our seed saving, herb growing, and herbal product production, manages our CSA, Farm Stand, and sales to other outlets. She is our beekeeping manager. Megan is a board member of the Nature Institute. Megan joined the Pfeiffer Center as an intern in 2006, and became a staff member in 2010. In 2014-2015, she studied seed saving under Harald Hoven at Raphael Garden in Fair Oaks, CA.

Kim joined TCF as one of the founding farmers in 2018 as our Dairy manager. In 2025, she shifted in the role of Farm Administrator,  overseeing all aspects of educational programming, fiscal responsibility, fundraising, events, and community relationship building. Kim first met biodynamics in 2010 at a year-long course with Harald Hoven at Raphael Garden in Fair Oaks, CA. In 2016, Kim stepped away from Waldorf kindergarten teaching to become a full-time apprentice at Raphael Garden, followed by a summer at Fulcrum Farm in Grass Valley, CA, where she helped tend a small herd of Scottish Highland cows. She continues her relationship with TCF’s herd through weekly milking and training her team of working steers, Tim and Tyler.

Hugh Williams is the retired owner of Threshold Farm in Philmont, NY. He was first involved with commercial fruit growing in 1961 and has been growing fruit trees and orchards using biodynamic methods on a commercial scale since 1974.

Hanna Bail is the owner/operator of Threshold Farm, taking over for her husband Hugh Williams who is now retired. She’s been at Threshold Farm since 1995 and has seen the baby trees turn into fully mature orchards. She and Hugh have continued to grow their operation through grafting techniques they have perfected themselves. As an integral part of building a farm individuality, Hanna has been carrying the making and use of biodynamic preps at Threshold Farm.

Craig Holdrege is a biologist, an educator, and Director of The Nature Institute in Ghent, NY, a research and education organization for a unique qualitative approach to science. Craig is the author of many books and articles on genetic engineering, genetics, and a holistic, Goethean approach to science.

Sherry Wildfeuer is the founder of the Stella Natura Biodynamic Planting Calendar, a co-worker at Camphill Village Kimberton Hills, PA, and a long-time active member of the Anthroposophical Society and the Agriculture Section of the School of Spiritual Science.