GILROY—As Bert Mar walked the grounds at South Valley Middle School, he was met with big smiles and warm greetings at every turn. Cars that whizzed by the school turned around when they saw him, the drivers eager to say hello. Mar recognized each instantly and answered them with a bright smile, a wave and a unique nickname he’d undoubtedly given them several years ago. He’s a familiar face in Gilroy—and for good reason.