Birth and death details are entered today solely on the basis that Henry Gruppe wrote both The Truxton Cipher and The Frigates (LibraryThing shows Henry as a single author with some editions of The Frigates authored by Henry E Gruppe). 'Find a Grave' on the internet, shows birth and death details for Henry Emile Gruppe (Lt USN). There appears to be no other detail available on the internet - obviously, please update if not the correct person - 31 Jan 2019.
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Henry Gruppe is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Henry Gruppe is composed of 4 names. You can examine and separate out names.