He later taught at the law school at Chancellor College in Zomba, a constituent of the University of Malawi, from 1970, before being nominated for politics in 1978.
During Late Kamuzu Banda's time he held a number of cabinet portfolios including those of Minister of Finance (1980-1981 and 1987-1994), Health, Local Government, and Education, among others.
After Late Kamuzu's defeat in the 1993 referendum he maintained his seat in Parliament and was later elected Speaker of the National Assembly of Malawi from June 2005-June 2009.
A member of the Malawi Congress Party, he represented the Lilongwe Mpenu Nkhoma constituency, a seat which he lost during the 1999 Late Bingu wa Mutharika's regime.
In May 2008 Chimango was asked to resign his post due to lack of confidence from opposition legislators for his open bias towards government.