ical ▁tradition , ▁it ▁can , ▁however , ▁be ▁already ▁understood ▁as ▁a ▁contribution ▁to ▁the ▁soci ology ▁of ▁knowledge . ▁With ▁his ▁hab il itation ▁th esis ▁The ▁Mak ers ▁of ▁Public ▁Op in ion , ▁although ▁with dra wn ▁by ▁the ▁author , ▁( see ▁above ) ▁he ▁was ▁to ▁become ▁a ▁pione er ▁of ▁the ▁theory ▁of ▁communication . ▁ ▁It ▁was ▁typical ▁of ▁Man heim ▁and ▁the ▁Leipzig ▁School ▁of ▁Soci ology ▁to ▁use ▁historical ▁argument ation . ▁ ▁The ▁London ▁years ▁make ▁up ▁the ▁phase ▁of ▁Man heim ▁the ▁anth rop ologist . ▁He ▁en hanced ▁his ▁work ▁adding ▁studies ▁in ▁cultural ▁anth rop ology ▁and ▁approaches ▁to ▁social ▁psych ology ▁The ▁years ▁in ▁Chicago ▁and ▁Kansas ▁City ▁show ▁Ernest ▁Man heim ▁the ▁empir ical ▁research er . ▁He ▁studied ▁and ▁wrote ▁about ▁the ▁inter relation ▁between ▁urban ▁life ▁style ▁and ▁psych ological ▁disease , ▁about ▁ju ven ile ▁problems , ▁crime ▁prevent ion , ▁minor ities ▁and ▁pre jud ices . ▁ ▁In ▁practice ▁Man heim ▁was ▁instrument al ▁in ▁impro ving ▁the ▁conditions ▁for ▁Af ro - American ▁students ▁at ▁the ▁University ▁of ▁Kansas ▁City . ▁ ▁The ▁Compos er ▁ ▁Man heim ▁was ▁also ▁a ▁composer . ▁In ▁Budapest ▁and ▁Vienna ▁he ▁attended ▁conserv ator ies ▁besides ▁his ▁scientific ▁studies . ▁About ▁ 1 9 2 2 ▁he ▁composed ▁his ▁Quint et ▁for ▁fl ute , ▁vi ola , ▁c ello ▁and ▁l ute . ▁In ▁Leipzig ▁he ▁created ▁cho ir ▁and ▁song ▁compos itions