Weiner has been an innovative teacher and mentor. The former Associate Chair for Graduate Education in Biology, he has mentored 11 PhD students, two postdocs, and 25 undergraduate researchers, and received the Graduate College's Outstanding Graduate Mentor Award in 2018. He developed a popular general education course called "How the Brain Works (And Why it Doesn't)," receiving the CLAS Collegiate Teaching Award in 2017. That year, he co-founded the interdisciplinary undergraduate neuroscience major, which has seen rapid enrollment growth.