""His responsum regarding "metzitzah b'peh" was strongly influenced by the Hatam Sofer's rulings, according to Meir Hershkovitz in his 1972 article on Horwitz.In 1863, Horowitz, along with Isaac Noah Mannheimer, defended Heinrich Graetz, in Viennese court when Graetz was accused of heresy for an article published by Leopold Kompert in a local journal.