Mononymous person town of Stendal, birthplace of the German art historian Johann Joachim Winckelmann, whom Stendhal admired. In the 20th century, a fourth French writer, Sidonie-Gabrielle Colette (author of "Gigi", 1945), used her actual surname as her mononym pen name, Colette. Some French actors and singers have used their given name or surname as a stage mononym. In the 17th and 18th centuries, most Italian castrato singers used mononyms as stage names (e.g. Caffarelli, Farinelli). The German writer, mining engineer and philosopher, Georg Friedrich Philipp Freiherr von Hardenberg (1772–1801), became famous as Novalis. The 19th-century Dutch writer Eduard Douwes Dekker (1820–87), better
Sidonie Matsner Gruenberg actions to help them grow in their individual expression. Gruenberg rejected what she saw as "arbitrary puritanism" in American parenting, saying that strict parents suggest "every desire and impulse of being Satanic." On behalf of Macy's, she lectured at an exposition on "why children should have toys" in 1928. Sidonie Matsner Gruenberg Sidonie Matsner Gruenberg (1881–1974) was a parenting expert, writer, and director of the Child Study Association of America. In her 1912 book "Your Child Today and Tomorrow", Gruenberg popularized the idea of giving an allowance to children so they could understand how to spend it. Sidonie Gruenberg was