Founded Urban.Us to help startups tackle big urban challenges.
Wrote a book, built a few startups (failed at some), raising 2 boys, married a Carioca, survived a bar fight and can still swim 25m under water.
Biggest achievement is making a list of "un-famous" angel investors. http://angelyak.com/2013/10/15/20-angels-crushing-it/
Looking for startups working on urban problems in areas like mobility, security, governance, sustainable building.