Kolinsky joins the agency from McCann Erickson, where he led the Intel consumer business across Singapore and Hong Kong.
Before that role, Kolinsky spent six years at McCann Erickson's New York office, working on brands including ExxonMobil, Avis and Gateway.
Jean-Paul Burge, the chief executive of BBDO/Proximity Singapore, said: "Jason is a tremendous talent with a fabulous pedigree in tech experience. He is a great fit with the BBDO/Proximity culture. I am certain we'll see great things from him."