Hey! Five years ago I worked in a lab (during undergrad) closely with a Postdoc who is now an Assistant Professor at a different school. I hardly interacted with the PI of the lab... should I ask the PI for the LoR because it was his lab, or should I ask the Postdoc? I believe the Postdoc will write me a more sincere LoR... but I also had the PI for one of his classes and got an A. PS I searched around for a thread on this already but didn't find anything. Although my SDN searching skills are not fully developed yet.