I knew they were hard to come by but there are only three teachers of it in the whole world! Are most koryu dieing out 'that' bad? Thats really depressing.
Things are not as dire for Tatsumi ryu as you imagine. Hiroshi Kato is the 22nd headmaster of Tatsumi-ryū. Outside Japan, Liam Keeley in Melbourne, Australia holds advanced teaching licenses and is authorized to represent the school at its highest levels. The last I heard Pierre Simon was authorized to teach in France while Miquel Morancho and Jaime Gamundí were authorized to teach in Spain. There are other licensed Tatsumi ryu instructors residing inside Japan.
That said, koryu are in a precarious position. My own school, Takamura ha Shindo Yoshin ryu currently has only a handful of authorized instructors worldwide.
Toby Threadgill / TSYR