Prof. Castillo is MNH's curator for Native Forest Trees. He is at present Assistant Professor 7 at the Department of Forest Biological Sciences, College of Forestry and Natural Resources, UPLB. Manuel finished his studies in UPLB: PhD in Forestry:  Forest Biological Sciences (Forest Taxonomy -Floristics); Master of Forestry; and BS in Forestry.

Manuel is a much sought after lecturer and trainer on biodiversity impact assessment, environmental rehabilitation and restoration, establishment and use of permanent plots, collection and preservation of plant specimens for herbarium, dendrology and tree identification, and preparation of biodiversity management plans.

Selected Researches

Inventory of Trees and Other Plant Forms in a 21.4 hectare PLOT in Barangay Tipo, Subic Bay Freeport Zone for Nestle Philippines Diliman, Science Research Foundation Inc.  March-April 2009

Inventory of Trees and Other Plant Forms in a 64 hectare PLOT in Barangay Tipo, Subic Bay Freeport Zone for Nestle Philippines Diliman, Science Research Foundation Inc. May-June 2009

Terrestial Flora and Faunal Assessment in Soccorro, Sablayan,Victoria and Pola Oriental Mindoro September 2007-September 2008

Greater Sipit Watershed Biodiversity & Habitat Protection Conservation Program – Project Staff  March 2006 - Feb. 2009 Makiling Forest Reserve  First Generation Holdings Inc. 

Resource Inventory of Angat Watershed “Floral Diversity Assessment of Biodiversity Component 01February 2006 – 31 January 2007 Environmental Forestry Program, UPLB-CFNR, College, Laguna.

Ground Truthing and Verification Study of Sitio Pulo’t Bae at Caliraya Watershed, Kalayaan, Laguna, ENFOR-UPLBFI , 01 January 2005-February 28, 2006.

Rapid Floral Biodiversity Assessment of Greater Sipit Watershed of Mt Makiling Forest Reserve (MFR), Makiling Center for Mountain Ecosystems. College. Laguna, March 27 –November 2004.

Floral Diversity Assessment of Southern Negros Geothermal Power Plant Areas, Lake Balinsasayao and Adjacent Areas, May – August 2004.

Floristic diversity at Kaliwa Watershed in Tanay, Rizal, Environmental Forestry Program, UPLB College of Forestry and Natural Resources, College, Laguna, Philippines March 2002 – October 2002.

Structure and Floristic Diversity of an Ultramafic Hill in Surigao del Sur, Northeastern Mindanao, Philippines, Surigao Development Corporation, Surigao del Sur.