Yanjun Sun is a research scientist in the laboratory of Lisa M. Giocomo at Stanford University. He received his Ph.D. from the University of California, Irvine, where he investigated the cell-type specific neural circuit organization and function of the hippocampal formation. In recognition of his doctoral studies, he was honored with the Krieg Cortical Kudos Scholar Award from the Cajal Club in 2017. In the Giocomo Lab, Sun investigated the neural circuit dynamics and computation underlying adaptive and maladaptive spatial learning. Using in vivo miniscope calcium imaging and computational methods, he discovered a new group of neurons in the subiculum that specifically encode concave and convex geometries of an environment. Sun also extends his research into substance use disorders. He is a recipient of a Mentored Research Scientist Career Development Award (K01) award to investigate the neural mechanisms underlying memory associations between spatial contexts and drugs of abuse. With support from the Simons Foundation, his future research will continue to explore the neural circuit mechanisms of learning, memory, and spatial navigation in hippocampal-associated circuits.