While working at his first startup, BrainGenie, a math and science skills practice website, Tim Zheng experienced firsthand the challenge of maintaining a small business — and expanding it. After trying a number of sales prospecting tools and finding that they weren’t that effective in getting the word out to customers, Zheng decided to build … Continue reading Apollo.io, a full-stack sales tech platform, bags $100M at a $1.6B valuation