NY Time article "The technique had been developed at Cambridge University’s Psychometrics Center. The center declined to work with Cambridge Analytica, but Aleksandr Kogan, a Russian-American psychology professor at the university, was willing.

Dr. Kogan built his own app and in June 2014 began harvesting data for Cambridge Analytica."

https://www.nytimes.com/2018/03/19/technology/facebook-cambr...