Josh is a partner at Greylock, where since 2017 he has led the firm's investments in several industry-defining fintech companies including Coinbase, Wisetack and has been a board director at PayJoy since 2018, when he led the company’s Series B. Prior to this, he co-founded TellApart, a company that applied AI-based predictive modeling to the field of marketing, and grew it to over $150M in annual revenue as CEO. TellApart was acquired by Twitter for more than $500M – the largest deal in the company’s history. He then served as Twitter’s VP of Product and oversaw all of the company’s revenue-generating lines, including advertising, data services and customer support applications.