Short answers, pulled from the story.
Murray Fletcher Pratt was arrested for burglary in February 1916. The Associated Press reported that the twenty-year-old Hobart College student had been stealing cash from newspaper drawers, netting less than twenty-five dollars in total.
Following World War II, the Pratts came into possession of a rambling 31-room Victorian mansion on a high bluff overlooking the Atlantic Ocean at Atlantic Highlands, New Jersey. Purchased by Inga Stephens Pratt's wealthy mother for use as a summer place, the house was whimsically dubbed The Ipsy-Wipsy Institute.
Pratt established the literary dining club known as the Trap Door Spiders in 1944. The name is a reference to the reclusive habits of the trapdoor spider, which when it enters its burrow pulls the hatch shut behind it.
Pratt's story Dr. Grimshaw's Sanitarium was adapted for radio drama by George Lefferts and broadcast twice, first on Dimension X on the 22nd of September 1950 and then on X Minus One on the 14th of July 1955.
David Kahn, author of the groundbreaking 1967 book The Codebreakers, gave full credit for his start on the subject to Pratt's Secret and Urgent published in 1939. Kahn had found the book in the Great Neck, NY public library as a pre-teen in the 1940s.