He once served as the Director of the Holy Spirit Research Center at Oral Roberts University .
Synan has published a total of sixteen books , fifteen of which are related to Pentecostal and Charismatic history .
Synan once served as the Director of the Holy Spirit Research Center at Oral Roberts University .
Synan has published a total of sixteen books , fifteen of which are related to Pentecostal and Charismatic history .