Look for usually square format, often low light, long exposure images with strong graphic elements and a minimum of "business". Kenna's photographs are lightly sepia toned, and often allow quite visible grain. They are also remarkable in being about 8 inches square in an era that welcomes much, much larger prints (Hoflehner makes prints up to 40" square I think...or somewhat near that size if I'm not totally accurate.). He also continues to photograph with film and use traditional analog processes for his prints.
Besides the photographers listed above, Adrian Davis, and David Fokos also work in a similar way (although with much larger, and often digital prints.) There are some folks here on APUG who also could loosely be identified as of that "school" if you will.
I love his work, and have studied "Retrospecitve Two" constantly for the half year I've owned the book. I've also seen his work in person at the AIPAD show. If you can get to a show like that, you'll likely get to see his work this year as well.