During his time in office he served as a member of the Executive Council of Alberta from 1971 to 1975 as a Minister without portfolio Responsible for rural development.
He defeated incumbent Social Credit MLA Michael Senych to pick up the new electoral district of Redwater-Andrew for the Progressive Conservatives.
After the election Topolnisky was appointed to the Executive Council by Premier Peter Lougheed as a Minister without portfolio Responsible for rural development.
[6] Topolnisky ran for re-election as an incumbent cabinet minister in the 1975 Alberta general election, he won a slightly higher popular vote easily keeping his seat.
[7] After the election the Premier did not renew Topolnisky's cabinet portfolio, he served in the assembly as a private member for the rest of his career.