As of 2008, Cohen lives in the San Francisco Bay Area, United States, with his wife Jenna and their three children.
Cohen’s hobbies include original origami and juggling up to five balls, but his main interest is in recreational mathematics. Cohen maintains a blog where he frequently discusses trust metrics with Raph Levien, as well as money systems, games of skill, and other math-related topics. He is also an assembly puzzle enthusiast. He has designed several puzzles including some in conjunction with Oskar van Deventer including several gear-based puzzles such as Gear Shift and a multiple Rubik’s Cube variant called Bram’s Fortress. Some of Bram’s puzzle designs are available for 3-D printing via Shapeways.
