The Department of Mechanical Engineering and Applied Mechanics (MEAM) is pleased to announce that Yifei Ren, a doctoral candidate in MEAM, has been selected as the recipient of the 2026 John A. Goff Prize, an annual award recognizing an outstanding graduate student for scholarship, resourcefulness, and leadership.
The Goff Prize honors exceptional academic achievement and initiative within the MEAM graduate community and includes a $2,000 award. The recipient will be formally recognized at the Penn Engineering Graduate Awards Ceremony on May 13, 2026, in Heilmeier Hall.
Ren joined the University of Pennsylvania in Fall 2022 as a master’s student after earning his bachelor’s degree in mechanical engineering from Dalian University of Technology in China. Even as an undergraduate, he demonstrated a strong commitment to research, publishing a paper in the Journal of Materials Science in 2021 and receiving multiple academic honors.
At Penn, Ren quickly distinguished himself academically, taking challenging graduate courses and achieving a perfect 4.0 GPA during his master’s program. His research productivity has been equally impressive: he has four published papers with another first-author paper currently under review.
Advancing Mechanics and Materials Research
Ren’s research spans several areas at the intersection of continuum mechanics, materials science, and biological systems, where he develops theoretical and computational models to better understand complex soft materials and biological structures.
One of his early projects explored how bacteria propel themselves using helical flagella. Working with his advisor and nominator, Prashant Purohit, Professor in MEAM, he developed a model that addressed a gap in the literature by treating flagella as deformable elastic rods driven by molecular motors, rather than rigid structures. Their model successfully matched experimental observations and was published in Extreme Mechanics Letters.
Ren has also contributed to research on synthetic mucins—branched polymer networks that mimic the structure of natural mucus. By combining continuum mechanics with poroelastic modeling, he demonstrated how the microscopic structure of these polymers influences their macroscopic mechanical behavior. His work showed that brush polymer gels can behave somewhere between elastomeric gels and fibrous gels depending on side-chain density. This research was published in the International Journal of Solids and Structures.
Beyond polymer networks, Ren has studied the gravity-driven settling of clay and colloidal gels, introducing new physics into models describing how these materials collapse from a rarefied to a densified state. His analytical and computational results successfully reproduced experimental data and were published in the European Journal of Mechanics A/Solids.
His work has also contributed to interdisciplinary collaborations linking mechanics and biomedical science, including studies on extracellular matrix poroelasticity and how fluid transport through gels may influence cancer growth and signaling.
Leadership in Teaching and Collaboration
In addition to his research achievements, Ren has demonstrated a strong commitment to teaching and mentorship. While still a master’s student, he served as a grader for MEAM’s elasticity course and later became a teaching assistant for advanced courses including continuum mechanics, elasticity, and advanced dynamics.
He has also taken an active role in collaborative research projects across Penn and with external partners, frequently leading interdisciplinary discussions and helping interpret experimental results using computational models.
Looking Ahead
Ren aspires to pursue a career in academia, and his work already reflects the intellectual curiosity and leadership that the John A. Goff Prize is designed to recognize. His research continues to bridge mechanics, materials science, and biomedical applications, with the potential to influence fields ranging from soft matter physics to medicine.
The MEAM community congratulates Yifei Ren on this well-deserved recognition.