Hiller is mentioned to have been taught early counterpoint by a Herrn Vollweiler, likely Johann Georg Vollweiler (1770-1847) [AMZ, Vol.37 (1835-1-21), p.34].
For Hiller's opinion of his contemporaries, see: Ferdinand Hiller’s Twelve Trips to Meet Old Friends in Heaven: A Little-Known Essay in Cultural Commentary from 1881 by Ralph P Locke, Jürgen Thym, The Musical Quarterly, Volume 106, Issue 1-2, Spring-Summer 2023, Pages 9–75 online edition