In spite of this, ``Sullivan took (Wright) under his wing and gave him great design responsibility.'' As an act of respect, Wright would later refer to Sullivan as Lieber Meister (German for ``Dear Master''). He also formed a bond with office foreman Paul Mueller. Wright would later engage Mueller to build several of _his_ public and commercial buildings between 1903 and 1923. <sep>, Pronoun: his <sep>, A: Wright <sep>, B: Mueller