Takumasa Ono was born and grew up in Tokyo. In 1999, he toured the UK sketching 58 National Trust properties, as an official artist of the National Trust in Japan. He returned to the UK as a visiting artist as part of Japan 2001, a UK wide initiative supported by the Japanese Ministry of Culture. During that time, he developed his 'HENRO (pilgrimage)' exhibition, working as an artist in residence with the National Trust. He has produced hundreds of pieces of artwork featuring more than 100 National Trust properties, through the medium of watercolour, screen-printing and Sumi-e, a traditional form of Japanese brushwork art.
Since then he has been undertaking artistic projects with many of the National Trust's leading properties across the UK, organizing educational workshops for children and adults as well as exhibitions. He was also awarded the "Japan Society Award" 2014 and has been commissioned to produce major pieces of Sumi-e work for the Japan Room at the Wales Millennium Centre in Cardiff Bay.