Henry Smith Williams (1863-1943) was a medical doctor, lawyer, and author of a number of books on medicine, history, and science.

It also announces that he was an expert on the "chemistry and biology of the blood cells" and had spent ten years intensively studying cancer.

His brother was the doctor Edward Huntington Williams, with whom he wrote his "History of Science (31 volumes)".

In his 1938 book, Williams predicted with a high degree of accuracy that, fifty years later, drug-smuggling would grow to become a five-billion-dollar industry.

Williams died still trying to end the drug war, his uncharacteristic book and his efforts at speaking out in favor of his brother's beliefs almost entirely suppressed and forgotten.