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Employment

• Professor Emeritus, UM, 2007 - present.
• Research Associate, UM, 2000-2007.
• Senior Research Fellow, UM, 1999.
• Professor for Chair of Zoology, UM, 1986-1998.
• Associate Professor, Dept. of Genetics and Cellular Biology, UM, 1974-March 1986.
• Lecturer, School of Biological Science, UM, 1968-June 1974.
• Tutor, Dept. of Zoology, UM, 1965-1968.
• Student Demonstrator, Dept. of Zoology, UM, 1964-1965.

Funded Research Projects

• All (national and international) already completed.

Teaching Interests

• Genetics, systematics, biodiversity and evolutionary biology
  
• Economic zoology and medical biology

Research Interests

• Biodiversity
• Systematics, genetics and ecology of fruit flies and other insect pests
• Systematics, genetics and evolutionary biology of stingless bees, braconid parasites and other hymenopterans
• Genetics, immunology and molecular biology of parasites, vectors and hosts
• Systematics, genetics and evolutionary biology of mammals, amphibians, reptiles and fish
• Genetic toxicology
• Animal and human cytogenetics
• Malaysian natural heritage

Publications & Presentations

• He has published more than 300 articles and 4 books (the citation databases of ISI listed 109 titles in 1998).
• Editors of several books (Malayan Nature Journal, Malaysian Journal of Science - over 20 years), magazines (Nature Malaysiana - 20 years), monographs, proceedings and Animals volume in Encyclopedia of Malaysia.

Professional Activities

• Adjunct Professor, UTAR, 2008 - present.
• Member, Academic Advisory Board, KBU International College, 2008-present.
• Member, Board of Directors, College IKIP Pahang Darul Makmur, present (and past several years).
• Member, Selection Committee, Malaysia Toray Science Foundation Science and Technology Awards and Research Grants, present (and past several years).
• Committee Member and Judge, ACCCIM Young Innovators Programme, 2007-2008.
• Editor, Ecological Research, 2006-present.
• Member, ACCCIM STI Committee, 2006-2008.
• Chief Editor, Journal of Science and Technology in the Tropics, 2004-present.
• Member, Panel of Assessors, National Science Award, 2004.
• International Judge, Intel-ISEF (International Science and Engineering Fair), 2003-2004.
• Chairman, Panel of Advisors, Inti Journal, 2002.
• Chairman, Academic Advisory Board, Kolej Bandar Utama. 2000-2008.
• Honorary Member, Academic Advisory Board, Inti College, Malaysia, 2000-present.
• Member, Panel of Assessors, National Yong Scientists Award / National Technologies Award, 1996-2003.
• Member, Technical Committee, National Botanical Gardens, late 1990s.
• Member, Editorial Board, The Raffles Bulletin of Zoology, since 1990s.
• Member, Advisory Board and Scientific Research Committee, Department of Wildlife and National Parks, MOSTE, 1990s.
• Chairman, Technical Committee for Biological Control of Vertebrates, National Council of Biological Control, 1990s.
• Member, BioNet International, 1990s.
• Member, Commonwealth Science Council Advisory Group on Biodiversity and Genetic Resource, late 1990s.
• Member, Assessment Panel for R&D Projects, Malaysian Rubber Board, late 1990s.
• Invited as speaker and session chairman in various conferences.
• External Examiner and Assessor for promotion exercises in various universities

Others

• Named after the following species of living organisms:
• Topomyia (Topomyia) yongi, 1990.
• Trypanosoma yongi, 1992.
• Johora hoiseni, 1992.
• Aesalus yongi, 1993 (now Echinoaesalus yongi).
• Pardalaspinus yongi, 1995.
• Duliticola hoiseni, 1996.
• Simulium yongi, 1997.
• Cladomyrma yongi, 1999.
• Manota yongi, 2006.
• Simulium (Gomphostilbia) hoiseni, 2008.
• Malayozodarion hoiseni, 2008.
• Kalophrynus yongi, 2009.