Two months ago, I was introduced to a startup called CityMart, a for-profit marketplace dedicated to helping vendors and city managers find one another — and to spreading municipal innovations outside of their home turf.

Last month, in Thailand, I met Jonathan Hursh, who runs Compassion for Migrant Children (soon to be renamed), which focuses on migrant populations — adults and children with few resources and few rights — in the slums that surround almost every large city in the world.

In mid-May, I'll be attending the New Cities Summit in Paris, a three-day forum focused on the future of cities.