doyen
noun [ C usually singular ] uk/ˈdɔɪ.en/ /dwaɪˈen/ us/ˈdɔɪ.en/ /dwaɪˈen/
（某一领域内的）老前辈，老专家
the oldest, most experienced, and often most respected person of all the people involved in a particular type of work
Synonym: dean
Compare: doyenne