Hiroyuki Tsujii was born in Sakamoto, Otsu City, Shiga Prefecture, Japan in 1970. After graduating from Osaka University of Arts, he aspired to become a landscape architect and learned a new style of gardening under Ken Nakajima, who created many Japanese gardens all over the world. In 2004, he became president of Tsujii Landscaping Co.

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Major overseas projects include: Restoration of the Japanese Garden at Tatton Park, England (1996), Gold Medal and Grand Prize for the Japanese Garden at the Chelsea Flower Show, England (2001), Japanese Garden at the National Botanic Garden, Wales (2001), Renovation of the Japanese Garden at the Rothschild Museum, France (2003), Royal Horticultural Society: Wisley Rock Garden Renovation (2005), Japanese Garden at the Japanese Cultural Institute in Rome, Italy (2017-2022), Dry Stone Walling of Stone Vessel, Joseph Walsh Studio, Ireland (2023-2024).

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In addition to his achievements as a landscape architect, Tsujii is a guardian of the Karasaki Pine Tree in his hometown Sakamoto, Otsu City. It is his mission to pass on the history of this sacred tree as well as the appreciation of its guardians who have supported it for nearly 1,400 years. The Karasaki Pine Tree was planted by Kotomitachi-Ushimaru in 633 at Karasaki Shrine, a branch of the Hiyoshi-taisha Shrine established about 2,100 years ago. Throughout its history, the Karasaki Pine Tree and the surrounding area has been renowned for its majestic beauty, being visited by many writers and artists and remaining loved by its people.