Nicolas Slonimsky, born Nikolai Leonidovich Slonimskiy, was a Russian-born American musicologist, conductor, pianist, and composer. Best known for his writing and musical reference work, he wrote the Thesaurus of Scales and Melodic Patterns and the Lexicon of Musical Invective, and edited Baker's Biographical Dictionary of Musicians.

Ḥayyim Selig ben Ya'akov Slonimski, also known by his acronym ḤaZaS, was a Hebrew publisher, mathematician, astronomer, inventor, science writer, and rabbi. He was among the first to write books on science for a broad Jewish audience, and was the founder of Ha-Tsfira, the first Hebrew-language newspaper with an emphasis on the sciences.