The Delphian School is a K-12 boarding school northwest of Salem affiliated with the Church of Scientology. They promote something called "Study Tech" — by most accounts a bogus pedagogical method developed by L. Ron Hubbard.
The Sheridan campus seems to be their flagship operation, but Delphian Schools have also operated in Sacramento and Santa Monica, and Study Tech has been implemented in a number of other private schools in the US and internationally, both Scientology-affiliated and not. Both the Delphian Schools and Study Tech seem to be in decline.