While in law school, Platt married Anne Byrd Symington in 1948.

[3] Platt was nominated by President Richard Nixon on January 31, 1974, to a seat on the United States District Court for the Eastern District of New York vacated by Judge George Rosling.

[3] At the time of his nomination, he was the first federal district court judge from Suffolk County, New York.

After over 25 years of active service, Platt assumed senior status on February 1, 2001, and served in that capacity until his death on March 4, 2017, in North Branford, Connecticut.

This biography of a federal judge in the United States is a stub.