According to Dan Smyer Yü's recent monograph on the subject, Tibetan Buddhism is currently experiencing a revival in certain regions such as Qinghai and Sichuan, which he describes as trans-cultural, cross-regional, tech-savvy, conversant with modern science and familiar with the economic system. Gray Tuttle has noted that Mount Wutai has experienced a growth of religious activity since the 1990s, led by Han, Tibetan and Mongol followers of Tibetan Buddhism. Temples, monasteries and stupas have been built or repaired in the area.