Donghoon is responsible for the fabrication of glass (fused silica and borosilicate) microfluidic devices.

Prior to the PhD study, he worked for Samsung Electronics for 12 years. His work at Samsung included microfabrication of optoelectronic devices, such as vertical cavity laser diodes and PIN photodiodes, and micromachining of silicon optical benches.

During his employment at Samsung, he also worked as a patent engineer in the field of microelectromechanical systems (MEMS).