About Gemini

Gemini is a privately-owned cryptocurrency exchange that lets you buy, sell, trade and securely store more than 60 cryptocurrencies. It was launched in 2014 by the well know, in the industry, Winklevoss Twins.

It's currently being changed by the US regulator, SEC.
https://news.bitcoin.com/sec-charges-genesis-and-gemini-winklevoss-says-regulators-lawsuit-is-super-lame/