Looking back on 27 years of teaching experience, it's tempting to think the biggest changes have been in technology. Certainly, going from carbon copies and mimeograph machines to word processing and teaching on Blackboard in a Web-blended course has been a huge transition. But the most radical transformation in teaching for the author began when he started teaching in learning communities. These teaching experiences were, indeed, a sea change for him because they transformed his pedagogy and how he teaches with colleagues. Because his teaching experiences were so powerful, and because he knew he couldn't be the only one having these experiences, he devoted his doctoral research to trying to determine how others perceived the effects of teaching in learning communities, including how teaching in stand-alone classes might have been altered as well. Ultimately, his dissertation research reinforced what he experienced in his own teaching: Those teachers teaching in learning communities did experience a sea change in their pedagogy. They could see how their participation influenced how they viewed what he calls "C" changes: camaraderie, cooperation, collegiality, collaboration, curriculum integration, creative teaching techniques, and community building, all of which influenced their growth and development as teachers. (Contains 13 endnotes.)