William Duncan McNallyWilliam Duncan McNally (July 8, 1882 – June 29, 1961) was the chief chemist in the Cook County Department of Public Health and the chief chemist for the Cook County Medical Examiner's office.[1][2] He invented an early breathalyzer in 1927.[3] He was a holder of M.D. BiographyWilliam Duncan McNally was born on July 8, 1882, in Saginaw, Michigan, to Elizabeth and Edward Henry McNally.[4][5] He graduated from the University of Michigan in 1905.[6][7] He married Helen Marie Pierce on September 22, 1906, in Chicago, Illinois. By 1911 he was working as a chemist at Armour and Company in East St. Louis, Illinois.[6][8] By 1918 he was the toxicologist for the Cook County Department of Public Health.[4] He invented an early breathalyzer in 1927.[3] He died on June 29, 1961, in Mobile, Alabama. Works
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