Global Tree Specialist Group Members

The IUCN/SSC Global Tree Specialist Group (GTSG) has over 80 expert members from botanic gardens, herbaria, universities and both governmental and non-governmental organisations.  Find out more about the specialists who help to inform the conservation work we carry out.

Michael B. Thomas

Flora of Hawaiian Islands, Pacific Islands, herbaria and collections management, ex-situ seed conservation, biodiversity informatics, data management, ethnobotany

Joseph F. Rock Herbarium, University of Hawaii at Manoa

Jonathan Timberlake

Systematic biology, vegetation survey, plant conservation, Acacia

The Herbarium, Royal Botanic Gardens, Kew, UK

Joel Timyan

Societe Audubon Haiti

Maria de los Ángeles La Torre-Cuadros

Management & conservation of tropical forests through understanding of natural & social processes

Faculty of Forest Sciences, Universidad Nacional Agraria La Molina, Peru

Dr. Carmen Ulloa Ulloa

Andean Flora

Missouri Botanical Garden, USA

Lahiru S. Wijedasa

Pursuing a PhD in Southeast Asian Peatswamp forest conservation and revising the taxonomy of Memecylon (Melastomataceae) in Indochina and Malesia.

National University of Singapore & ConservationLinks

Dr. Peter Wilkie

Sapotaceae, taxonomy, systematics, conservation

Royal Botanic Garden Edinburgh, UK

Nelson Zamora

Herbarium of the National Institute of Biodiversity of Costa Rica

Nyree Zerega

Director and Senior Lecturer, Plant Biology & Conservation Graduate Program, Herbarium Director and Plant Systematist

Northwestern University &Chicago Botanic Garden