author
A prolific late-19th-century writer and lecturer, she is best remembered for publishing under the pen name Jasper Niemand and for her ties to the Theosophical movement. Her work moves between fiction, essays, and spiritual writing, giving it an unusual mix of imagination and earnest inquiry.

by William Quan Judge, Julia Wharton Lewis Campbell Ver Planck Keightley
An American writer, lecturer, and Theosophist, she was also known as Julia Keightley after her marriage to Dr. Archibald Keightley. Sources about her identify her full name as Julia Wharton Lewis Campbell Ver Planck Keightley and note that she wrote under the pseudonym Jasper Niemand.
She appears to have built a varied literary life, publishing fiction and essays as well as spiritually oriented work. Project Gutenberg lists her among its authors, and reference sources connect her with Letters That Have Helped Me, a work associated with William Quan Judge and Julia Wharton Lewis Campbell Ver Planck Keightley.
Available source material focuses strongly on her role in the Theosophical world, where she and her husband were active in the movement. Reliable biographical details beyond that are relatively sparse in the sources I could confirm here, so this overview keeps to the broad outlines that appear consistently.