Clarence Weston Hansell (January 20, 1898 – c. 1967) was an American research engineer who pioneered investigation into the biological effects of ion air.
He was granted over 300 US patents, including, in the 1930s, a precursor to the modern ink jet printer that could print 750 words a minute, its data received via radio telegraph.
Hansell founded the RCA Radio Transmission Laboratory at Rocky Point, New York, Long Island in 1925, and headed the lab for over 30 years.
His interest in the biological effects of ionized air was spurred in 1932 when he noticed that the moods of one of his colleagues at Rocky Point Laboratory swung in response to the ions being generated by their equipment.
Current scientific studies support his findings, and negative ion therapy may be useful in alleviating depression in some people.