[1] He began to study medicine and attended the University of Edinburgh in Scotland for his tertiary education in 1963, where he earned a degree and returned home to Barbados to become the Head of the Department of Medicine as Senior Physician Specialist and the Chief of Medical Staff at the Queen Elizabeth Hospital (QEH).
Haynes began his tenure in politics by running as a candidate for the Democratic Labour Party for the 1978 St. Michael South Central by-election which was triggered after the resignation of DLP member Frederick Smith.
[3][2] As a member of parliament, Haynes remained in the opposition until the DLP retook the government in the 1986 general elections.
This would mark the most recent time a party that was not the DLP or the BLP would win a seat in a general election.
Haynes would later receive the national award of the Knight of St Andrew in 2003 as recognition for his contributions to Barbados in the field of health care.