The Princeton Review is an education services company providing tutoring, test preparation and admission resources for students. It was founded in 1981. and since that time has worked with over 400 million students. Services are delivered by 4,000+ tutors and teachers in the United States, Canada and international offices in 21 countries.; online resources; more than 150 print and digital books published by Penguin Random House; and dozens of categories of school rankings. The Princeton Review’s affiliate division, Tutor.com, provides online tutoring services. The Princeton Review is headquartered in New York City and is privately held. The Princeton Review is not associated with Princeton University. Corporate history The Princeton Review was founded in 1981 by John Katzman, who—shortly after graduating from Princeton University—began tutoring students for the SAT from his Upper West Side apartment. A short time later, Katzman teamed up with Adam Robinson, an Oxford-trained SAT tutor who had developed a series of techniques for "cracking the system." Katzman built the Princeton Review into a national and then international operation and served as CEO until 2007, when he was replaced by Michael Perik. In March 2010, Perik resigned and was replaced by John M. Connolly. In April 2010, the company sold $48 million in stock for $3 per share, and a short time later was accused of fraud in a class action suit filed by a Michigan retirement fund, which claimed The Princeton Review leadership exaggerated earnings to boost its stock price. In 2012, the company was acquired by Charlesbank Capital, a private equity fund, for $33 million. On August 1, 2014, the Princeton Review brand name and operations were bought for an undisclosed sum by Tutor.com, an IAC company, and Mandy Ginsburg became CEO. The company is no longer affiliated with its former parent, Education Holdings 1, Inc. On March 31, 2017, ST Unitas acquired The Princeton Review for an undisclosed sum. The company is now privately held. Test preparation The Princeton Review offers test preparation courses, tutoring services, and or guidebooks for various tests via the Princeton Review website: ACT Advanced Placement Exams (AP Exams) Chartered Financial Analyst (CFA® Level I) Chartered Financial Analyst (CFA® Level II) Dental Admission Test (DAT) GED Graduate Management Admission Test (GMAT) Graduate Record Examination (GRE) ISEE Law School Admissions Test (LSAT) Medical College Admission Test (MCAT) NCLEX-RN Optometry Admission Test (OAT) PSAT SAT SAT Subject Tests Secondary School Admission Test SHSAT