Marvin Appel, MD, PhD, is the CEO and founder of Appel Asset Management Corporation and vice president of Signalert Corporation, registered investment advisors of the Appel Financial Group, which represents and handles over a half-billion dollars in investments of individuals, corporations, and partnerships from across the country. Dr. Appel is an expert in timing models both in their development and in their analysis, and he counsels investors to take advantage of changes in relative strength relationships or to leave the market altogether. His work in developing strategies to reduce risk and optimize portfolio diversification has been reported in Newsday, Forbes.com, Wall Street Transcript, CNBC, and CNNfn. Dr. Appel is a regular contributor to Dental Economics, a contributing editor of the Physician's Money Digest, and is also co-editor of Systems and Forecasts, a newsletter in its 30th year of publication. He is a frequent speaker at conferences for market professionals and is recognized as a national authority on newly developing investment instruments and opportunities, especially exchange-traded funds. Dr. Appel earned his MD in 1991 and a PhD in biomedical engineering in 1992, both from Harvard University, then completed an internship at Massachusetts General Hospital and a residency in anesthesiology at John Hopkins in 1995. Family responsibilities and the subsequent, dramatic changes in healthcare, however, impacted his vision of medicine. He decided to leave the field and pursue capital management--a business that had been his family's focus for more than 20 years.