St. John's Northwestern Military Academy (SJNMA) was founded in 1884 as St. John's Military Academy (SJMA) in Delafield, Wisconsin, by the Rev. Sidney T. Smythe as a private, college preparatory school. In 1995, Northwestern Military and Naval Academy (NMNA) in Lake Geneva, Wisconsin, merged with St. John's Military Academy to become St. John's Northwestern Military Academy on the Delafield campus. In 2020, a Leadership Academy was added and the combined schools became St. John's Northwestern Academies. SJNA is a coed independent boarding and day school for boys and girls in grades 6–12. St. John's Northwestern Summer Academy offers Little Lancers Day Camp, Summer Academy Plus, and ESL courses.

Nick Gravenites is an American blues, rock and folk singer, songwriter, and guitarist, best known for his work with Electric Flag, Janis Joplin, Mike Bloomfield and several influential bands and individuals of the generation springing from the 1960s and 1970s. He has sometimes performed under the stage names Nick "The Greek" Gravenites and Gravy.