Stefan Brockhoff is a pseudonym that was used collectively by a group of three German co-authors of several detective novels, all of them having certain characteristics in common: they were all born in Germany at or about the beginning of the second decade of the twentieth century; at one point or another they all of them became refugees from Nazism; and they all eventually lived out their lives in the United States of America. Moreover, to every one of them the writing of detective novels was a youthful avocation

Avocation

An avocation is an activity that one engages in as a hobby outside one's main occupation. There are many examples of people whose professions were the ways that they made their livings, but for whom their activities outside of their workplaces were their true passions in life...

, their principal interests and activities in later life lying in different areas.

• Dieter Cunz
  Dieter Cunz
  Dieter Cunz , German-born American historian, writer, educator, and occasional journalist. He is also said to have co‑authored several detective novels or Kriminalromane in collaboration with Oskar Seidlin and Richard Plant under the collective pen‑name of Stefan Brockhoff .Cunz was born in the...
  
   (1910–1969)
• Richard Plant (1910–1998)
• Oskar Seidlin
  Oskar Seidlin
  Oskar Seidlin ; German-born American literary scholar, poet, and writer of children’s stories. He is also said to have co‑authored several detective novels or Kriminalromane in collaboration with Dieter Cunz and Richard Plant under the collective pen‑name of Stefan Brockhoff.Born Oskar Koplowitz...
  
  (1911–1984)