Dr. Lee Kudrow, who had CH, founded the first private headache center in the western US and in 1981 he published the first substantial research on oxygen for CH. I think he might have been the first to consider O2 as a treatment, but I'm not sure about that. He was the first to recognize medication overuse headaches. His son, David, runs that clinic now (somewhere in California, but I'm not sure where). His daughter is the actor Lisa Kudrow.