Dr Dafydd Trystan Davies has been elected by party members as the new chair of The Party of Wales, succeeding Helen Mary Jones.
Aberdare-born Dr Davies, a Higher Education Registrar, is a former Chief Executive of Plaid Cymru.
Dafydd Trystan Davies said: "I’m delighted to have been elected chair of Plaid Cymru. My aim is to build on the strong foundations left by my predecessor, Helen Mary Jones.
"These are exciting times for Plaid Cymru and I intend to play my part in preparing the party as we head towards the National Assembly for Wales elections in 2016.
"As chair I’ve a very important role to play as a voice for members in the party, bringing together the volunteers across the country and linking them into the elected members and the professional staff of the party."
Dafydd Trystan Davies added: "As chair, I’m keen to engage with our young members, ensure a higher percentage of women candidates representing the Party and to attract people from all backgrounds to Plaid Cymru. I also want to hear from those who are interesting in contributing to Plaid Cymru, whether or not they are party members."
Dafydd Trystan Davies, who lives in Cardiff with his wife, Lisa, was educated at Ysgol Rhydfelen and Aberystwyth University, gaining a 1st class honours degree and PhD on Globalisation and the Welsh economy.
He chairs Wales’ prize-winning social enterprise, Cycle Training Wales, is a Director of TooGoodToWaste, a Rhondda Cynon Taf-based social enterprise and is a board member of sustainable transport body, Sustrans Cymru.