Sosa Sensei's services are pretty much like Sosa Sensei was - private. I am surprised that his death has made this forum. My sensei was never one to publicize anything - even his books were someone else's idea. The aikido that he was teaching was exceptional, and one of the best kept secrets in the aikido world. "The proof is in the pudding" - just look at his students if you have had the opportunity to do so.
More information can be gotten from the IAA board of directors. I don't feel that any information should come from me. We will sorely miss this great man - but his spirit and aikido will live through all people that he had an impact on.
Sosa Sensei, we love you, miss you, but we will continue what you have started.