Current delivery platforms for RNA and gene editing technologies induce off-target effects and fail to specifically target tissue types. Led by Columbia’s Dr. Fatemeh Momen-Heravi and Dr. Akiva Mintz, the Enviar team has recently developed a novel customizable delivery platform—called SafeExo—based on engineered exosomes. Exosomes naturally carry biomacromolecules including different RNAs (mRNAs, regulatory miRNAs, etc.), DNAs, lipids, and proteins and can deliver their cargoes to the recipient cells, elicit functions, and mediate cellular communications. SafeExo is the first engineered exosome platform capable of eliminating endogenous nucleic acids, which greatly reduces off-target effects. SafeExo is further optimized to enhance RNA stability, CRISPR efficacy, target uptake and specific cell/tissue delivery of large payloads, such as targeted CRISPR/CAS gene editing machinery and RNAi therapeutics. This platform has the potential to treat new diseases and improve current therapies.