Julian May was an American science fiction, fantasy, horror, science and children's writer who also used several pseudonyms including Ian Thorne, Lee N. Falconer and many others.
Some 1960's and 1970's biographies and children's science books may belong to Julian May (the science fiction & fantasy writer) profile but no reliable source has been found
Per Encyclopedia.com, May wrote juvenile science non-fiction along with the science fiction novels for adults. (https://www.encyclopedia.com/arts/edu...)
- via Goodreads