John Crestani is a growth hacker known for his contributions in helping companies reach more people and sell more products using the business model of affiliate marketing. He is an online expert in all forms of paid advertising; from Facebook Ads, Google Adwords, Youtube Ads, and Native advertising networks.

John Crestani is also an affiliate marketer. Initially he worked with affiliates on ebay. Later he got marketing job in Los Angeles which gave him lots of marketing related experience. After voluntarily resigning that job, he became an affiliate marketing entrepreneur. In the year 2017, John Crestani, Francisco Ramos and Nikita Danilov founded an entrepreneurial training company called WeLearn at California.