More than a million viewers tune in weekly to watch “Rough Cut, Woodworking with Tommy Mac,” a production of WGBH Boston, distributed by American Public Television. The how-to series is helmed by Tommy MacDonald, an amiable, knowledgeable, plainspoken man who is at home in his workshop, as well as in corporate offices and executive boardrooms around the nation. It is his ability to be a down-to-earth craftsman, as well as a producer of television and social media content, which distinguishes MacDonald from many of his peers. He doesn’t shy away from new challenges or risk-taking opportunities. Rather, it’s quite the opposite: He never allows an unfamiliar invitation to cause him to fade into the woodwork!