Craig Forrest, Ph.D., recalled the day four years ago when one of his Department of Microbiology and Immunology mentors, Xuming  Zhang, Ph.D., D.V.M., came looking for him.

Forrest had sought input from Zhang and mentor Usha Ponnappan, Ph.D., on his first NIH National Cancer Institute grant application. Zhang found him in a fifth-floor lab of the Biomedical One building. There, standing at the freezer, the two had one of the more consequential mentoring sessions of Forrest’s early career.