August 2008- Present:Program Coordinator, Master Program in Physics, Royal University of Phnom Penh.
April 2008- Present:Team leader of Cambodia team for the International Olympiad on Astronomy and Astrophysics (IOAA).
July 2007- Present:Team leader of Cambodia team for the International Physics Olympiad (IPhO).
2006- Present: Team leader of Cambodia team for the Asian Physics Olympiad (APhO).
October 2004 to Present: Full-Time Lecturer, Physics Department, Faculty of Science, RUPP, Cambodia.
October 2004 to Present: Part-Time Lecturer, Department of Electrical and Electronics Engineering, Build Bright University, Cambodia.
October 2005 to Present: Lecturer and Electronics course Program Coordinator, Continuing Education Center, RUPP, Cambodia.
June – October 2006: Teaching Assistant, Department of Electronics and Telecommunication Faculty of Engineering, KMUTT, Thailand.
July – October 2005: Teaching Assistant, Department of Electronics and Telecommunication Faculty of Engineering, KMUTT, Thailand.
January to July 2005: Part-Time Lecturer, Department of Electrical and Electronics Engineering, NTTI, Cambodia.
April - July 2005: Part-Time Lecturer, Department of Computer Engineering, ASEAN University, Cambodia.
Oct 2002 - Oct 2004: Teaching Assistant, Department of Electronics and Telecommunication Faculty of Engineering, KMUTT, Thailand.
Oct 2001- Oct 2002: Teaching Assistant, Department of Physics, RUPP, Cambodia.
Oct 2007 to March 2008: Research Project for, Ministry of Education, Youth and Sport, The 6th Regional Congress “SSYS”, Malaysia.
Oct 2005 to March 2006: Research Project for, Ministry of Education, Youth and Sport, The 5th Regional Congress “SSYS”, Malaysia, (Got Best Paper Award).
Oct 2005 to March 2006: Research Project for, Ministry of Education, Youth and Sport, First Step to Nobel Prize (2 papers Got Honorable Mention).