For someone who now holds a very specific, focused job-Chief Operating Officer at urban farming business Brooklyn Grange , helping run the two largest rooftop farms in the world and leading the firm's green design and installations division- Gwen Schantz , 34, has taken a rather meandering path. There was the international studies coursework at Vassar College; the summer spent on a farm in upstate New York; the year in Cambodia working for a nonprofit; the cross-country journey that took her to Alaska for a summer of fishing; the stint as a pizza cook in Brooklyn.