Obaku Zen is a unique blend of Zen Buddhism and Pure Land elements, and it was founded by a Chinese monk named Ingen Ryuki. Ingen was born in 1592 in the Fujian province of China and was originally named Zhang Wuzhu. He was a member of the Linji school of Zen Buddhism, which emphasized the use of koans and meditation to achieve enlightenment.

Ingen was a highly skilled monk and was recognized for his spiritual abilities at a young age. He became a disciple of the famous Zen master, Zhuhong, and studied under him for many years. However, after Zhuhong's death, Ingen felt that the teachings of the Linji school had become too rigid and dogmatic. He began to search for a new way to practice Zen that would be more accessible to the common people.

Ingen's search led him to Japan, where he encountered the Pure Land teachings of the Jodo sect. The Pure Land school emphasized the practice of chanting the name of the Buddha, Amida, as a means of attaining rebirth in the Pure Land after death. Ingen was intrigued by this approach and saw the potential for combining it with his Zen practice.

In 1654, Ingen arrived in Japan and was warmly welcomed by the ruling Tokugawa shogunate. He was given permission to establish a Zen temple in the city of Uji, just outside of Kyoto. This temple, known as Manpuku-ji, became the headquarters of the Obaku school of Zen.

Under Ingen's leadership, Obaku Zen flourished and gained many followers in Japan. He was known for his humble and compassionate nature, and his teachings were accessible to people of all backgrounds. He also introduced Chinese cultural elements, such as tea ceremony and calligraphy, to the practice of Zen in Japan.

Ingen passed away in 1673, but his legacy lived on through his disciples and the Obaku school of Zen. Today, Obaku Zen is still practiced in Japan and has also spread to other countries, including the United States. Ingen's unique blend of Zen and Pure Land teachings continues to inspire and guide practitioners on their spiritual journeys.

In conclusion, the founder of Obaku Zen is the Chinese monk, Ingen Ryuki. His vision and teachings have left a lasting impact on the world of Zen Buddhism, and his legacy continues to be honored and practiced by many.