詹志勇係香港地理學家，有「樹博士」之稱，主力研究市區生態地理，並致力於保護香港市區各處嘅大樹同古樹。佢曾經係香港大學地理學系講座教授，喺港大服務37年，而家係香港教育大學教授。詹係香港最早研究並發掘石牆樹價值嘅學者。佢因為研究市區生長嘅樹木而多次獲得香港大學嘅傑出研究員獎。
Chim Chi-yung is a Hong Kong geographer known as "Dr. Tree", who specializes in the ecological geography of urban areas and is committed to the conservation of large and ancient trees in urban areas. He was a Chair Professor in the Department of Geography at the University of Hong Kong, where he served for 37 years and is now a Professor at The Education University of Hong Kong. Chim was one of the first scholars in Hong Kong to study and discover the value of stonewall trees. He has received several Distinguished Research Fellow Awards from the University of Hong Kong for his research on trees growing in urban areas.