He does naught but bury himself in his books without any contact with the outside world. I'm afraid his theses will be so wishful so as to lack any connection to actual society.
Examples (Wiktionary)
Mandarin
她的黑暗史足以写出一本书。
她的黑暗史足以寫出一本書。
tā de hēi àn shǐ zú yǐ xiě chū yī běn shū .