Kirsten Greenidge has joined Company One Theatre as playwright-in-residence while Melinda Lopez will continue in that role at the Huntington Theatre Company for another three years, moves made possible by the Andrew W. Mellon Foundation and HowlRound. Greenidge has been Company One’s playwright in residence before, but the Mellon grant creates a new, full-time job at the theater company. Both Lopez and Greenidge, the latter an Obie Award winner in 2012, have been busy playwrights both locally and nationally. The Huntington produced Lopez’s “Becoming Cuba” in 2014, as well as Greenidge’s “Milk Like Sugar” during the current season. “I really see myself as a member of a global community of playwrights now, and I think that’s largely because of the institutional perspective,” Lopez said.