Isidore Troostwyk (1862-1923) was a brilliant violinist from Zwolle in the Netherlands. He began studying the violin at the age of ten, and when he was sixteen, admiring patrons funded lessons with Joseph Joachim in Berlin. (Joachim later sent him to the United States with a letter of recommendation.) In 1883 Troostwyk was appointed professor of the violin at the Academy of Music in Amsterdam, and was appointed concertmaster of the Concertgebouw orchestra. During his career in Holland, he played under conductors such as Brahms, Bruch, Benoit, Rubenstein, Bülow, Massenet, Moszkowski, and Grieg.
Troostwyk emigrated to the United States in 1888. He was co-founder of the Dessauer-Troostwyk School of Music, at 781 Chapel Street in New Haven, incorporated in 1893. Troostwyk joined with the co-founder of the School, flutist Max Dessauer (b. 1864), and Dessauer's sister Erna (b. 1865), to form the Dessauer-Troostwyk Trio. Troostwyk became the concertmaster of the New Haven Symphony at the time of its organization in 1894. (The first concert was in January 1895.) In 1895, Troostwyk was appointed as the first Instructor of Violin at the newly established Yale School of Music, where he was later promoted to Assistant Professor, and performed as a member of the Faculty Trio. Troostwyk was the founding conductor of two orchestras: the New Haven String Orchestra (1907) and the Bridgeport Symphony Orchestra.
Troostwyk's entire family was involved in music. In addition to his wife Erna (a pianist and composer) and brother-in-law Max Dessauer, his and Erna's children became talented and successful musicians in their own right. Their son Leo became the principal cellist in the New Haven Symphony Orchestra and was appointed Instructor of Cello in 1912 at the Yale School of Music. Their daughter Hendrika was known as a child prodigy on the violin, and also played viola. Their son Arthur was a violinist in the New Haven Symphony Orchestra, and played in the Leo Troostwyk Trio with his brother Leo and pianist Roy J. Ward. Leo, Hendrika, and Arthur played with their father in the Troostwyk Family Quartet.
From the guide to the The Troostwyk Family Papers, 1894-1957, (Irving S. Gilmore Music Library, Yale University)
