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 "to help natural healthcare providers achieve their personal and practice goals, despite managed care and other influences."[1]

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.