Speak, an English language learning platform backed by OpenAI's startup investment fund, the OpenAI Startup Fund, today announced that it raised $16 million in a Series B-2 funding round led by angel investor Lachy Groom. The co-founders of Dropbox, Drew Houston and Arash Ferdowsi, also participated in Speak's tranche, which brings the startup's total raised to $63 million. CEO Connor Zwick says that it'll be used to support Speak's launch in more markets, including in the U.S. by the end of the year.