· Assistant Professor, Texas A&M University.  Development of cultivars that are herbicide resistant, that produce superior main and ratoon crop quality and yield, use less irrigation water, and that are resistant to diseases and insects

· Chief Science Research Specialist, Philippine Rice Research Institute, Science City of Muñoz, Philippines 
· Program Leader ? Transplanted Irrigated Lowland Rice Program of Philippine Rice Research Institute, Science City of Muñoz, Philippines
· Chair, Philippine Rice Technical Working Group
· Chair, Philippine Rice Research Institute Bio-safety Committee
· Affiliate Faculty, Central Luzon State University, Science City of Muñoz, Philippines
· Project Leader (up 2001):Rockefeller Foundation Project on marker-based identification of loci for resistance to local isolates of blast and bacterial blight 
· Project Leader: Rice Asian Biotechnology Network project on gene pyramiding 
· Project leader: Development of inbred rice varieties for transplanted irrigated lowland at PhilRice; Backcross breeding to transfer important traits in rice; Marker-aided selection for blast and bacterial blight resistance
· Research Counterpart (Breeder), JICA Project on Varietal Development. 

· Supervising Science Research Specialist, Philippine Rice Research Institute, Science City of Munoz Concurrently acting as: Program Leader of Transplanted Irrigated Lowland Rice Program 
· Project leader: Development of inbred rice varieties for transplanted irrigated lowland at PhilRice; Backcross breeding to transfer important traits in rice; Marker-aided selection for blast and bacterial blight resistance
· Study leader on 'Asian Rice Biotechnology Network research on pyramiding genes 
· Research Counterpart (Breeder), JICA Project on Varietal Development. 

· Rockefeller Foundation Fellow at Texas A&M University, College Station, Texas

· Research Assistant, Plant Breeding Department, International Rice Research Institute (IRRI), College, Laguna, Philippines 

· Research Associate, Legume Breeding Section, Institute of Plant Breeding, University of the Philippines at Los Baños (UPLB), College, Laguna, Philippines 

· Instructor, Department of Crop Science, Central Luzon State University (CLSU), Muñoz, Nueva Ecija, Philippines 

· Research Assistant, Breeding Section, Cotton Research and Development Institute (CRDI), Mariano Marcos Mariano Marcos State University, Batac, Ilocos Norte, Philippines

Fellowship on Rice Biotechnology from the Rockefeller Foundation- (1991-1996)

Member of Gamma Sigma Delta, Honor Society of Agriculture - TAMU Chapter, 1993-96

In Service Fellowship on Groundnut ImprovementInternational Crop Research in Semi-arid Tropics (ICRISAT)Hyderabad, India Mar. 16-31, 1985

UNESCO-UPLB Training Workshop on the Teaching of Crop Improvement University of the Philippines Los Baños, College, Laguna Philippines Oct. 19 - Nov 1, 1980

1988 Best Poster Award (co-author)Third Scientific Meeting of the Federation of Crop Science Societies of the Philippines, Davao City, Philippines. March, 1988.

2000 Best Paper Award (co-author)Annual Scientific Meeting of the Crop Science Society of the Philippines, Batac, Ilocos Norte, Philippines. March, 2000.

Second Best Poster Asian Crop Science CongressWestin Philippines Plaza, March 2001

Tabien, R.E., Z. Li, A.H. Paterson, M. A. Marchetti, W. D. Park, J.W. Stansel, S.R.M. Pinson. 2002. Mapping QTLs for field resistance in rice to the blast pathogen and evaluating their individual and combined utility in improved varieties. Theor Applied Genet 105:313-324.

Padolina, TF, ER Corpuz, HCC de la Cruz, RE Tabien, JM Niones, RO Solis, S Mizuno, T Ito, T Sasali, K Moriya. 2002. Development of PJ lines at the Philippine Rice Research Institute. PhilRice Tech Bull. 6:1-9.

Tabien, RE, TF Padolina, HC de la Cruz, ER Corpuz, J Fariñas. 2002.New NSIC rive varieties for cool elevated, saline prone and upland areas of the Philippines Plenary paper presented at the 15th National Rice R&D Review and Planning Workshop, April 10-12,2002. PhilRice, Maligaya, Science City of Munoz, Philippines.

Tabien RE. 2002 Rice Varietal Improvement: Issues and Concern. Paper presented at Rice Master Plan: Augmenting the low yield in the Philippines, March 5, 2002. PhilRice, Munoz, Nueva Ecija.

Tabien RE. 2002. Conventional methods of crop improvement with emphasis on rice. Lecture delivered at Training Workshop for the Advocates of Science-Based Evaluation of GMOs January 16-18, 2002, PhilRice, Science City of Munoz, Nueva Ecija Philippines.

Tabien, RE. 2002. Biotechnology at Philippine Rice Research Institute. Paper presented at the Symposium on Biotechnology: Modern mean in challenging Agriculture August 8, 2002. PhilRice, Science City of Munoz, Nueva Ecija, Philippines.

Tabien, RE. 2002. Varietal release and the characteristics of 2002 releases NSIC rice varieties. Paper presented at the National Rice Program (GMA) planning workshop. Oasis Hotel, Pampanga. Sept.1-2, 2002.

Bustamam, M. RE Tabien , Suwarno, MC Abalos, TS Kadir, I Oña, M Bernardo, CM Vera Cruz, H Leung. 2002. Asian Rice Biotechnology Network: Improving popular cultivars through marker-assisted backcrossing by the NARES. Poster presented at the International Rice Congress, Beijing, China. Sept. 16-20, 2002.