Since 1962, Hans Hielscher has appeared in more than 2200 organ recitals worldwide, including 31 concert tours in 39 states throughout the United States. He has performed in Festivals and major recitals at Cathedrals in Germany, France, Great Britain, Italy, Spain, Switzerland, The Netherlands, Norway, Sweden, Finland, Denmark, Iceland, Luxembourg, Czech Republic, Hungary, Israel, South Africa, Australia, New Zealand, Singapore, Hong Kong, Canada, The Bahamas and the United States. Since 1974, Hans has been organizer and organist for Organ Study Tours throughout Europe.

He is a recording artist for the Motette, Organophon, IFO and Wergo (Schott) labels with 14 organ solo CDs to his credit, and has made various radio and television recordings in Germany, the United States, and Australia. His organ compositions are published by Taverner (England), Butz (Germany) and FitzSimons Editions (U.S.). Author of Alexandre Guilmant - Life and Work, History of the Organ and the Musicians at Wiesbaden Marktkirche and Famous Organs in America (published by Edition Dohr, Cologne), he also translated the German edition of Michael Murray's biography Marcel Dupré - The Life of a Master Organist (published by Edition Lade, Vienna). In 1985, Hans Hielscher was organist for Immanuel Presbyterian Church in Los Angeles in an exchange program with Samuel John Swartz. Since 1986, he has appeared frequently as guest professor and lecturer/recitalist at the University of Redlands, where his subjects were 19th century organ music and improvisation.Hans was awarded the Chevalier de l'Ordre des Arts et des Lettres by the French government in 1985 for his worldwide promotion of French organ music.

He is a longtime member of the AGO (American Guild of Organists), OHS (Organ Historical Society), and GCNA (Guild of Carillonneurs in North America).