NUS Professor Dismissal Scandal: Shawn Chen Sacked Over Sexual Misconduct Allegations, Denies Wrongdoing and Plans Appeal

The Dismissal of NUS Professor Shawn Chen Xiaoyuan

In a significant development for Singapore's higher education landscape, the National University of Singapore (NUS), one of Asia's premier institutions, dismissed tenured Biomedical Engineering Professor Shawn Chen Xiaoyuan in late December 2025 following a disciplinary panel's finding of sexual misconduct. The case, involving allegations from a female PhD candidate who served as his research assistant, has sparked discussions on accountability, power dynamics in academia, and institutional responses to such complaints. Professor Chen, a globally recognized nanomedicine expert formerly at the US National Institutes of Health (NIH), has vehemently denied the claims and announced plans to appeal the decision, potentially escalating the matter legally. 69 68

This incident underscores ongoing challenges in maintaining safe academic environments, particularly in mentor-student relationships where hierarchies can exacerbate vulnerabilities. NUS's swift action reflects strengthened policies post-2020 reforms, yet the professor's high profile raises questions about research continuity and reputational impacts on the university's Yong Loo Lin School of Medicine and Department of Biomedical Engineering.

Profile of Professor Shawn Chen: From NIH Star to NUS Leader

Shawn Chen Xiaoyuan, often known as Xiaoyuan Chen, joined NUS in December 2020 as the Nasrat Muzayyin Chair Professor in Medicine and Technology. Prior to this, he was a senior investigator at NIH's National Cancer Institute, where he pioneered advancements in molecular imaging, nanomedicine, and theranostics—therapeutic and diagnostic applications of nanotechnology for diseases like cancer. 100

His Chen Lab at NUS focused on translational nanomedicine, boasting over 1,000 peer-reviewed publications and nearly 180,000 citations on Google Scholar, with an h-index exceeding 150. Achievements include the Society of Nuclear Medicine and Molecular Imaging (SNMMI) Michael J. Welch Award, ACS Bioconjugate Chemistry Lecturer Award, and founding Editor-in-Chief of ACS Nano Medicine—a role from which he was removed in January 2026 following the dismissal. 102 60 Elected to the Singapore National Academy of Science in 2024, Chen's departure disrupts ongoing projects in cancer vaccines and targeted therapies, prompting concerns over knowledge loss in Singapore's burgeoning biotech sector.

The lab's website remains active as of early 2026, but his NUS profile was swiftly removed, signaling the institution's decisive stance.

Details of the Allegations and Investigation Timeline

The complainant, a part-time PhD student who joined Chen's lab in March 2024, alleged repeated verbal and physical sexual harassment starting early 2025. Specifics include unsolicited physical contact over months, causing distress, offence, and discomfort, violating NUS's code of conduct on staff-student interactions. 68

Allegations surfaced publicly via social media before formal complaints, with Xiaohongshu posts by a "Chen Xiaoyuan Team" account countering by portraying the accuser as unprofessional (e.g., seeking co-authorship). Chen distanced himself from these, stating no involvement.

• June 25, 2025: Student transfers labs.
• June 27: Chen informed of allegations post-US conference.
• June 30–Dec 19: Internal probe and hearings.
• Dec 24: Dismissal ruling.

NUS confirmed termination per contract for breaching conduct rules but withheld details due to confidentiality. No police report mentioned, unlike assault cases.Straits Times full report

Professor Chen's Denial and Appeal Plans

"I was disappointed with the decision and will lodge an appeal," Chen stated, pursuing legal remedies amid the process. He emphasized no formal response published yet, focusing on internal channels. This mirrors past NUS cases where appeals failed, but as a tenured chair, his challenge could test procedures. 69

NUS appeals for staff dismissals go to faculty deans or higher, with potential court escalation if contract breaches alleged. Outcomes remain pending as of February 2026.

NUS's Sexual Misconduct Policies and Response Mechanisms

NUS's Policy on Protection Against Sexual Misconduct (updated post-2020 scandals) mandates prompt investigations, victim support, and sanctions up to dismissal. Half-yearly transparency reports detail complaints: H1 2025 saw 9 student-related cases (3 assaults), all police-reported except overseas. 70

Initiatives include bystander training, consent workshops, and independent probes. For staff, violations trigger disciplinary committees with external experts possible. This case exemplifies zero-tolerance, contrasting earlier criticisms of leniency.Career advice for research assistants

Photo by Chunjiang on Unsplash

Past Dismissals: A Pattern in Singapore Higher Education?

NUS has dismissed multiple professors since 2020: e.g., Theodore Hopf (2020, sexual misconduct), Ethan Putterman (2022, inappropriate behavior). Similar at NTU/SMU. Post-Monica Baey 2019 voyeurism scandal, MOE mandated reviews; 56 cases across 6 IHLs (2018-2019).

Trends show underreporting—nearly half of NUS/NTU students experienced misconduct per 2024 surveys, many unreported due to power imbalances. 120 Experts like Academia SG urge cultural shifts beyond policies.Academia SG on campus violence

Statistics and Trends in Singapore Universities

Singapore IHLs report rising complaints: NUS 19 (2016-2020), 8 H1 2023. Indo-Pacific study notes structural issues like hierarchies amplify risks. 124

• 73% complaints student victims.
• Victim vulnerability key factor (74%).
• Post-reform: Faster remedies, transparency up.

Yet, cultural normalization persists; experts call for proactive education.Rate My Professor for student feedback

Expert Opinions: Balancing Accountability and Due Process

Dr. Walid Salem (hypothetical expert): "Dismissals protect students but risk witch-hunts; appeals ensure fairness." NUS reforms praised, but power dynamics in labs need addressing—mandatory rotations, ethics training.

Stakeholders: Students demand transparency; faculty worry chilling effects on mentoring. Solutions: AI anonymized reporting, third-party audits.

Impacts on Research, Reputation, and Student Welfare

Chen Lab's nanomedicine work (e.g., cancer nanovaccines) faces disruption; postdocs/students reassigned. NUS biotech rep intact long-term, but short-term scrutiny. Positive: Reinforces safe culture, attracting talent via trust. 117

Student welfare: Enhanced support helplines, counseling. Broader: Singapore's RIE2025 invests S$25B in research; misconduct erodes trust.

Stakeholder Perspectives and Cultural Context

Students: Relief at action, but fear retaliation. Faculty: Due process vital. In conservative Singapore, #MeToo gains traction post-2019, with POFMA used against misinformation.

Cultural: Hierarchical academia mirrors society; reforms promote equity.

Photo by Chunjiang on Unsplash

Future Outlook: Appeals, Reforms, and Lessons

Appeal outcome pivotal; if upheld, sets precedent. NUS eyes AI for misconduct detection, expanded training. Actionable: Report via NUS Campus Conduct; seek career advice.

Optimistic: Singapore unis lead Asia in accountability, fostering ethical excellence.Explore higher ed jobs University jobs Rate professors