Archibald E. Stevenson (September 23, 1884 – February 10, 1961) was an American attorney and legislative researcher. Stevenson is best remembered for his work as Assistant Counsel of the Lusk Committee of the New York State Senate from 1919 to 1920, the activities of which led to a series of sensational raids and trials of self-professed revolutionary socialists. Stevenson was also the de facto author and editor of the Committee's four-volume report, which anticipated congressional investigations of communism conducted in subsequent years.
Archibald Ewing Stevenson was born September 23, 1884 in Uniontown, Pennsylvania, located in the rural western part of the state. Stevenson's father was a noted geologist and a professor at New York University. He was raised as a Presbyterian and later in life was a member of Fifth Avenue Presbyterian Church of New York City.
The precocious Stevenson was a published author at the age of nine, composing a travel memoir called From New York to Alaska and Back Again.
Stevenson graduated from New York University with a Bachelor of Science degree in 1904, graduating first in his class. Following graduation Stevenson began to follow in his father's footsteps, teaching at NYU as an instructor of Mineralogy following graduation. In 1908 Stevenson was placed in charge of the Department of Geology at NYU.
The appeal of science did not hold Stevenson's interest and he studied law in his free time, graduating from New York Law School with a law degree in 1909. He passed the New York State Bar exam in 1910 and was admitted to practice, forming a partnership called Graham & Stevenson. That same year, Stevenson married Katherine De La Vergne, with whom he had three daughters born in 1911, 1915 and 1919.