Jack has written an important book titled Sleeping Well. This book describes his break-through, patented SleepShield™. A SleepShield, in short, is half of a Faraday cage, and serves to reduce or eliminate geomagnetic and electromagnetic fields.
Geomagnetic and electromagnetic fields decrease sleep efficiency. They interfere with the body's central nervous system, thereby limiting immune-system potential. These GMF's and EMF's also cause cancer (19 studies cited) and increase cancer-cell proliferation dramatically (100 cases noted).
Sleeping Well shows how, using a simple voltmeter, you can measure the degree of danger in your sleep environment. This book lends credence to the last two words in Jack's eight-word healing slogan—"Bad Things Out, Good Things In, Good Sleep."