In 2002, Geoff Teehan co-founded the design agency, Teehan+Lax. He and his company helped shape products at Facebook, Medium, Google, YouTube, Yahoo, Tumblr, Flipboard, Prismatic, Weather Network, LG and more. In early 2015, Geoff moved on to Facebook as a Design Director. He leads the News Feed, Feed Ads and Interfaces design teams. In the article below he takes the time to review the changes in digital design over the past two decades, and what we can learn from them.