- Clifford D. Simak
- Alfred Bester
- George O. Smith
- George O. Smith
- Winston K. Marks
- Richard Edward Connell
- Mack Reynolds
- Basil Wells
- Katharine Fay Dewey
- Sir E. Ray Lankester
- Frank Riley
- Poul Anderson
- Edward Peattie
- Karl Groos
- Arthur M. Lewis
- Daniel G. Brinton
- Joseph A. Hester
- Rudolf Steiner
- Friedrich von Hellwald
- Robert J. Braidwood
- Sir Daniel Wilson
- Alan Edward Nourse
- Giovanni Cena
- F. L. Wallace
- G. Frederick Wright
- H. R. Hall
- R. G. Latham