From Mike's web site:
Representing the Church of Scientology in External Affairs
In 1981 I began what would become a
lengthy history working on “external affairs” when I was sent on the first “Obs Mission” to the Guardian’s Office at World Wide (WW) at St Hill, followed by a long series of Sea Org Missions to disband the GO, both at WW (St. Hill in England) and the USGO in Los Angeles. I subsequently held various posts in Special Project and then the Office of Special Affairs (OSA) the external facing arm of scientology – from Legal Aide to
CO OSA US to
CO OSA Int and Watchdog Committee
(WDC) for OSA. During this time I also held other posts, LRH PPRO International, various other WDC posts and CO CMO Int.
But the vast majority of time was in OSA. From the early 90’s I became the primary international spokesperson for the church.
https://www.mikerindersblog.org/mike-rinder-bio/
With respect to OSA...
Its head is Mike Rinder (right), a longtime Scientologist and ally of David Miscavige. In the early 1980s he helped to push through the dismemberment of the GO (coyly described as "a series of projects designed to reorganize the legal and public affairs representation of the Church").
He was rewarded in 1985 with the job of looking after all Church legal and public affairs in the United States, a role extended in 1987 to cover external Church affairs internationally as head of OSA International (OSA Int. for short).
http://www.xenu.net/archive/go/osahist.htm