Erhard is the author of the final chapter of Hayek: A Collaborative Biography, a book about economist , edited by Robert Leeson.
In 1895 he was acquired Swiss nationality and though he was offered posts at Vienna, Basle and Wurzburg, he declined these, preferring to remain in Zurich.
After moving to Sausalito, he attended seminars by , a Western interpreter of , who introduced him to the distinction between mind and self; Erhard subsequently became close friends with Watts.