Zach Sims is CEO of Codecademy, a startup that is changing the way people learn how to code by making it fun and straightforward. Sims, who left Columbia to start the company, now takes care of the responsibilities of Codecademy full time, along with co-founder Ryan Bubinski, who graduated from Columbia College in 2011. The two have expanded Codecademy’s user base and popularity by developing programs like Code Year, which delivers free weekly coding lessons to your inbox.