Skip to main content




Paula Diane Relf, PhD, HTM Professor Emeritus has pioneered work in horticultural therapy as one of the founding professionals in what is now the American Horticultural Therapy Association, serving as executive director from its inception into the mid-80’s and as president from 1975-1979. She was also a founder of the International People-Plant Council and served as chair from 1989 to 2003. Diane continues to influence and inspire worldwide in horticultural therapy, horticulture, and Extension, education, and health services with her on-going presentations, publications, and projects including THAD.  

Leadership for THAD has been provided by Lesley Fleming, HTR, Leah Diehl, HTM, Trish Hildinger, HTR, Gerry Sherman, HTR and Catherine Crowder, HTR.

THAD Contributors Guidelines

Thad Activity Template

Kathy Anderson

Rob Bennaton

Maureen Bethel

Kathy Brechner

Carolyn Brown

Joanna Brown

Amy Bruzzichesi

Kathy Carroll

Bob Carroll

Janet Carter

Casey Cook

Catherine Crowder

Leah Diehl

Lesley Fleming

Bridget Gaines

Christina Gigliotti

Angie Girdham

Megan Goulden

Katie Grimes

Karen Haney

Sally Haskett

Faryn-Beth Hart

Mitchell Hewson

Trish Hildinger

Beth House

Shannon Jarrott

Helen Kwack

Anne Larsen

Kathy Laurenhue

Marcia Lilley

Hillary Lindsay

Alexandra Marcaccio

Lisa McCuaig

Yuki Miyake

Susan Morgan

Janice Morrison

John Murphy

Karen Nelson

Erin O’Connor

Katherine Oliver

Mary Partridge

Peg Pecora

Antonia Phillips

Zuzana Poláčková

Mary Predney

Diane Relf

Mallory Schroer

Gerry Sherman

Bree Stark

Sarah Sterling

Jessica Sullivan

Christene Tashjian

Siang Yu Tham

Emilee Weaver

Erica Wharton

Jeanne Willis

Christina Wilson

Morgan Whitaker Smith

Silvia Yoshimizu-Yee