Lei "Stanley" Qi (Chinese: 亓磊; pinyin: Qí Lěi; born August 17, 1983) is an assistant professor in the Department of Bioengineering, and the Department of Chemical and Systems Biology at Stanford University. Qi led the development of the first catalytically dead Cas9 lacking endonuclease activity (dCas9), which is the basis for CRISPR interference (CRISPRi). His laboratory subsequently developed CRISPR-Genome Organization (CRISPR-GO). Qi is a co-inventor of the University of California patent on the CRISPR gene-editing technology.