The City of St. John's said Tuesday that it is not renewing the contract of city manager Bob Smart. 

Neil Martin, deputy city manager, has been appointed acting city manager, effective immediately. 

"I wish to thank Mr. Smart for his service to the City of St. John's and wish him well in his future 
endeavours," Mayor Dennis O'Keefe said in a terse statement. 

No reasons were cited in the city's statement as to why it is parting ways with Smart, who had previously worked as a former deputy minister in the provincial civil service. 

Smart, who was hired on a three-year contract that started in April 2011, confirmed he is leaving the city's top administrative post. 

"It has been decided not to exercise the two-year renewal option," Smart said in a statement. 

Smart said his tenure included a $300-million "infrastructure renewal strategy," as well as a move to a three-year budgeting cycle. 

"There is a great team of employees at the city, under the capable leadership of Mayor O'Keefe. Keep up the good work," Smart's statement said. 

Smart came under fire last summer over how he was managing staff, as well as over hiring choices made through a restructuring of management positions. 

"The suggestion that there is widespread and deep-seated morale problems here at city hall, in my view, is highly and grossly exaggerated," Smart told reporters last August.