 SAN JOSE, Calif.--BUSINESS WIRE--Calix, Inc. NYSE: CALX today announced the Board of Directors has unanimously elected current CEO and Board member, Carl Russo, to Chairman of the Board, combining the CEO and Board Chair roles. The Board has appointed current Board Chairman, Don Listwin, to serve as lead independent director of the Board. I want to express my sincere thanks to Don for his guidance and contributions as Chairman of the Board over the past fourteen years as the company embark 