Derecho tributario
Shumiatcher left government employ in 1949 to start his own legal practice in Regina. Regarded as a "brilliant" lawyer, he specialized in [[Labour law|labour]], [[Tax law|tax]], and [[corporate law]] and argued numerous cases in [[constitutional law]] before the [[Supreme Court of Canada]]. His appeal on behalf of Eleanor Ellen Farr in "Farr v. Farr" (1984) led to changes in Canada's matrimonial property law. He represented [[Joe Borowski (politician)|Joe Borowski]] before the Supreme Court of Canada in the latter's 1980s challenge to the constitutionality of [[abortion law]]; the court declared the case moot in 1989.