Zynga co-founder Justin Waldron is building a mobile gaming unicorn Justin Waldron co-founded gaming company Zynga with Mark Pincus when he was 19. Today, he is an investor in over 50 companies across the globe, and has also founded another gaming startup - Playco. 0 claps Good morning! Justin Waldron is no stranger to the gaming world. Often regarded as a pioneer in the social gaming circuit, having built and introduced viral game titles to users during his stint at Zynga — a company he co-founded (along with Mark Pincus) as a 19-year-old in 2007. He also happens to be an investor in over 50 companies across the world.