Directory

Douglas F. Jacobs

Douglass F. Jacobs

Director, Tropical Hardwood Tree Improvement and Regeneration Center (Tropical HTIRC)
Douglass F. Jacobs is the Fred M. van Eck Professor of Forest Biology in the Department of Forestry and Natural Resources at Purdue University and Affiliate Graduate Faculty in the Department of Natural Resources and Environmental Management at the University of Hawai‘i at Mānoa. He studies the ecology and physiology of forest regeneration. He began working in Hawai‘i in 2003, co-instructing a course on forestry nursery systems to Pacific Island managers, which led to the publication of the Tropical Nursery Manual (USDA Forest Service Agriculture Handbook 732). He was based in Hilo during 2016, where he was a Visiting Professor at University of Hawai‘i at Mānoa and the USDA Forest Service Institute of Pacific Islands Forestry. As Director of Tropical HTIRC, he leads an integrated research and extension program to promote the restoration of native Hawaiian forest tree species.

Tropical HTIRC Advisory / Steering Committee:


The role of the committee is to provide guidance on the strategic directions of the center, prioritization of research themes, and staffing. The committee is comprised of members representing diverse groups associated with ecology and management of Hawaii's forests. Many of the committee members are active collaborators on Tropical HTIRC research and extension projects.

Name Title, Institution
Steve Bergfeld Hawai‘i Island Branch Manager, DLNR Division of Forestry and Wildlife
Phil Cannon Forest Pathologist, USDA Forest Service, Pacific Southwest Region
Mark Coggeshall HTIRC Co-Director, USDA Forest Service, Northern Research Station
Nicholas Comerford Dean College of Tropical Agriculture and Human Resources, University of Hawai‘i
Susan Cordell Director, Institute of Pacific Islands Forestry, USDA Forest Service, Pacific Southwest Research Station
Nicklos Dudley Forester and Maunawili Experiment Station Manager, Hawai‘i Agriculture Research Center
J.B. Friday Extension Forester, University of Hawai‘i
Christian Giardina Research Ecologist, USDA Forest Service, Pacific Southwest Research Station
Robert Hauff Protection Manager, DLNR Division of Forestry and Wildlife
Diane Haase Western Nursery Specialist, USDA Forest Service, Pacific Northwest Region
Travis Idol Associate Professor of Tropical Forestry and Agroforestry, University of Hawai‘i
Nicholas Koch Research and Specialty Consulting, Forest Solutions, Inc.
Creighton M. Litton Professor of Ecosystem Ecologist, University of Hawai‘i
Robert K. Masuda First Deputy Director, DLNR
Irene Sprecher Forest Program Manager, DLNR Division of Forestry and Wildlife
Robert Wagner Department Head, Forestry and Natural Resources, Purdue University

Tropical HTIRC Graduate Students, Staff, and Affiliate Scientists

Achyut Adhikari

Achyut Adhikari

Achyut is a MS student at the University of Hawai‘i, studying biology of koa reproduction and vegetative propagation, to help overcome koa wilt.
Lilian Ayala

Lilian Ayala

Lilian is an MS student at Purdue University, studying genetic variation in cold tolerance, survival, and growth of high-elevation koa.
Owen Burney

Owen Burney

Owen is an Associate Professor at New Mexico State University. He is leading projects related to thinning of juvenile stands of koa and collaborating on other initiatives.
Aziz

Aziz Embrahimi

Aziz is a post-doctoral scientist at Purdue University, studying genes related to cold tolerance in koa.
Shaneka

Shaneka Lawson

Shaneka is a Research Plant Physiologist with the USDA Forest Service, Northern Research Station, studying genetic variation among koa populations and genes regulating the formation of figured wood.
Rebekah Ohara

Rebekah Ohara

Rebekah is a Ph.D. student at Purdue University, studying pathways and opportunities for the development of community-managed forests in Hawai‘i.
Indira Paudel

Indira Paudel

Indira is a post-doctoral scientist at Purdue University, studying adaptiveness of koa populations to resource availability.
Kyle Rose

Kyle Rose

Kyle is a research scientist with Tropical HTIRC (summer) and Assistant Professor at New Mexico Highlands University. He is leading projects related to alternative silvicultural systems for koa and clonal propagation.
Anna Sugiyama

Anna Sugiyama

Anna is a post-doctoral scientist at Purdue University, studying use of intraspecific variation to predict seedling performance in koa.
Emily Thyroff

Emily Thyroff

Emily is a Ph.D. student at the University of Hawai‘i, studying ecology and physiology of forest regeneration.
Adel Youkhana

Adel Youkhana

Adel is a post-doctoral scientist at the University of Hawai‘i, studying clonal propagation of koa.

Tropical HTIRC Graduate Student Alumni and Past Staff

Gaoussou Diarra

Gaoussou Diarra

Gaoussou completed his Ph.D. at the University of Hawai‘i in 2015, studying seedling nutrition.
Erin Hickey

Erin Hickey

Erin completed her M.S. at the University of Hawai‘i in 2016, studying vegetative propagation.
Faith Inman

Faith Inman

Faith was Tropical HTIRC project coordinator and Research / Extension Faculty with University of Hawai‘i from 2013-2016.
Bradley Kaufmann

Bradley Kaufmann

Bradley completed his M.S. at the University of Hawai‘i in 2016, studying nursery systems. He was then Tropical HTIRC project coordinator and propagation specialist until 2018.
Oriana Krauss

Oriana Krauss

Oriana completed her M.S. at Purdue University of Hawai‘i in 2014, studying tree improvement. She was a Tropical HTIRC research associate and University of Hawai‘i Junior Extension Agent until 2016.
Bob Masuda

Bob Masuda

Bob was a Tropical HTIRC senior advisor from 2010-2017.
Charles Michler

Charles Michler

Charles was a USDA Forest Service Northern Research Station Project Leader and the first Tropical HTIRC director.
Juan Oliet

Juan Oliet

Juan was a visiting professor with Tropical HTIRC during 2014-2015, studying ecophysiology of forest restoration. He is a Professor at the Technological University of Madrid, Spain.
Kyle Rose

Kyle Rose

Kyle completed his Ph.D. at Purdue University in 2017, studying the adaptive role of heteroblasty in koa.
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