[5] He practiced as a chiropractor in Philadelphia,[5] and during that time helped to found the (now defunct) Pennsylvania College of Chiropractic.
[7] His publications cover over 60 topics related to chiropractic care,[5] with titles such as Allergies, Asthma & Emphysema, Blood Pressure, and more.
[7] In 1995, Koren was under investigation by the Federal Trade Commission (FTC) after an anonymous complaint for "false and misleading advertising".
[5] In 2008, the World Federation of Chiropractic (WFC) accused Koren of "serious professional misconduct" by offering seminars in the technique to non-chiropractic practitioners.
[1] He believes the chiropractic method of adjusting subluxations may have positive results that range from asthma to premenstrual syndrome according to his pamphlets.