Sun is a pioneer in microrobotics and biomedical engineering, making numerous breakthroughs in robotic manipulation of cells for precision medicine.

Sun was named a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2015[1] for contributions to robot-aided manipulation of biological cells.

Sun founded a high-tech company at the Hong Kong Science Park, involved in technology transfers and conducting extensive applied researches in advanced robotics and motion controls with impactful contributions to industry and society.

In January 2022, Sun was one of three people, out of 90 legislative council members, who took his oath using Mandarin rather than the local language, Cantonese.

[5] In November 2022, Sun met with employees of Google and "mounted solemn negotiations" about the search engine's ranking of Glory to Hong Kong.