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An English engineer and Theosophist, he is remembered for writing on spiritual and ethical themes as well as for a whimsical children's story, The Great Red Frog. His life seems to have bridged technical work, public lecturing, and a deep involvement in the Theosophical movement.
Sidney Ransom appears in available sources as an English engineer who was also active in Theosophy. Theosophy Wiki describes him as Captain Sidney Ransom, notes that he was married to Josephine Ransom, and says he lectured widely, wrote articles, and took part in the Liberal Catholic Church.
His surviving published work shows a mix of interests. He is associated with The Ethics of the Secret Doctrine, a 1935 lecture rooted in Theosophical ideas, and with The Great Red Frog, a children's tale later preserved by Project Gutenberg. That combination suggests a writer comfortable moving between spiritual discussion and imaginative storytelling.
Reliable biographical detail on his dates, early life, and wider career is limited in the sources I could confirm here, so this portrait is necessarily brief. Even so, the record that remains points to someone who contributed to early 20th-century esoteric writing while leaving behind at least one enduring work for younger readers.