The Professional Association of Diving Instructors (PADI) is the worlds largest recreational diving membership and diver training organization founded in 1966 by John Cronin and Ralph Erickson. Cronin was originally a NAUI instructor who decided to form his own organization with Erickson, and to break diver training down into several modular courses instead of the single universal course then prevalent. PADI courses range from minimal entry level to relatively advanced recreational diver certification, several specialized diving skills courses, usually connected with specific equipment or conditions, some diving related informational courses and a range of recreational diving instructor certifications. Under the PADI TecRec brand, they also offer various technical diving courses. PADIs sister company Emergency First Response Corp provides a range of first aid and CPR programs for lay people, including workplace specific programs in Australia, Canada and the UK. PADI claims to be the leading training agency for scuba diving in the world. As of 2016[update] it has a membership of over 136,000 individuals and 6,300 dive centers, and has awarded more than 24,000,000 diving certifications internationally.