I'm the Director of Studies at Tyndale Theological College (Sydney), having succeeded Dr B. Ward Powers upon his retirement last year. With respect to qualifications I have Bachelor and Master degrees in theology, a few qualifications in non-theological fields, and am currently completing my doctoral dissertation. My undergraduate Major was in biblical Greek language and literature.
Over the years I've taught Greek from Wenham, Dobson, Mounce and Powers, as different institutions in Australia favour different texts (which made things 'interesting' when tutoring students from a range of colleges and universities simultaneously). It's been my experience that each text enjoys individual strengths, which make them attractive for different reasons, but I'm probably guilty of holding a bias towards Ward's textbook.