Keiser is the creator, co-founder, and former CEO of HSX Holdings/Hollywood Stock Exchange, later sold to Cantor Fitzgerald.
Είναι ο δημιουργός, συνιδρυτής και πρώην Διευθύνων Σύμβουλος της HSX Holdings / Hollywood Stock Exchange, που αργότερα πωλήθηκε στην Cantor Fitzgerald.