Sojern is a provider of a data-driven traveler that uses programmatic buying and learning technology. [1] [2] Sojerns, OTAs , OTAs , to collect anonymized (non-personally identifiable) travelers based on these sites. [2] [3] The company uses this data to target travelers and deliver advertising across a number of media channels. [1] [3] Sojern is currently headquartered in San Francisco, with key offices in New York, Omaha, Dubai, Singapore, London and Dublin.[1] [4]