At Pembrokeshire Council Ranson manages two teams, overseeing the authority’s planning policy and built and environmental conservation. She is also responsible for producing the authority’s Local Development Plan.
Ranson has worked in planning, economic development and regeneration in Wales for more than 20 years.
She has previously worked for the Snowdonia National Park Authority, the Welsh government and several local authorities.
"I’m delighted to have been elected to the role, and excited by the prospect of being president in the Institute’s centenary year in 2014" she said.
"However, important as the centenary is, it is two years away. During that time I want to encourage the active involvement of members in the work of the institute, support new entrants into the profession, and help raise the appreciation of the role of planning and of professional planners in shaping people’s communities and lives."
The presidential inauguration ceremony, where Ranson will formally become junior vice-president, will take place on 18 January.