David Singer
David Singer, DC, is a chiropractor, a Scientologist, and the founder, in 1981, of the controversial consulting firm now known as David Singer Enterprises.  Singer is an accomplished speaker primarily engaged in training chiropractors to increase the efficiency and Profit (accounting)of their practices.  The firm and its predecessor Singer Consulting, however, have also brought hundreds of new members into the Church of Scientology, triggering a nationwide controversy among chiropractors over concerns that it may be, largely or in part, a Proselytizing front group for the church.  Since the 1980s, Singer has held seminars throughout the United States promoting Scientology founder L. Ron Hubbard's business methods, which revolve around 'management by statistics'.

# David Singer Enterprises
Singer has had a major impact on the approaches taken by chiropractors to building their practices.  Singer offers one-on-one consulting programs, media products, and practice expansion seminars.  The Singer System was developed, ostensibly, "to help natural healthcare providers achieve their personal and practice goals, despite managed care and other influences."
Singer Consultants was once licensed, by Scientology's World Institute of Scientology Enterprises (WISE) to sell Hubbard's management techniques, before merging with another Scientology management company in 1988 to form Singer Enterprises, itself a member of WISE since 1992.  Singer Consulting was once ranked as one of the fastest growing private businesses in the United States, and was twice named among Inc. Magazine's Top 100 Fastest Growing Companies. In 1987, officials of David Singer Consultants said that 20 percent of the chiropractors who sign up for management consulting also wind up in Scientology courses.

# Notes
-  Sappell, Joel (1990-06-27). "Church Seeks Influence in Schools, Business, Science". Los Angeles Times. p. A1:1. Retrieved 2007-09-14. It brought hundreds of new members into the church and triggered a nationwide controversy among chiropractors over its links to Scientology. Unknown parameter |coauthors= ignored (help).mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"\"""\"""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{display:none;font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em} Additional convenience link at .
-  Koff, Stephen (1987-09-29). "Chiropractors seeking advice find Scientology-influenced seminars". St. Petersburg Times. Retrieved 2007-09-14.