Despite the gloomy global economy, the field of positive psychology is booming. Often described simplistically by journalists as "the science of happiness," it's actually a broad focus on our strengths and talents, virtues and peak experiences in daily living. The name for this specialty originated with Martin Seligman at the University of Pennsylvania a dozen years ago. With amazing speed, it has spawned courses at hundreds of colleges, best-selling books, websites and workshops on topics like mindfulness, and wide-ranging research on the links between mood and wellness.

Yet, amid this flurry of excitement, it's shameful that so little credit is given to a key figure who helped shift the focus away from Sigmund Freud's gloomy fixations to a more optimistic view of human nature: Daisetz Teitaro Suzuki. More than any other Eastern thinker in the 20th century, he catalyzed the rise of humanistic psychology in the post-World War II era — and, indirectly, today's mounting interest in spirituality and inner well-being. As 2011 marks the 55th anniversary of Suzuki's death, the time is right to remember the remarkable man born in what's now Kanazawa, western Japan.

Suzuki was descended from a long line of physicians of the samurai class. He was expected to follow in their path, but when he was only 6, his father died and this goal became financially impossible. Academically gifted, he taught English in several small towns before initiating higher education at Tokyo Senmon Gakko (the predecessor of Waseda University) and the nonregular course at the Imperial University in Tokyo. But by his early 20s, Suzuki felt drawn to spiritual matters, and became a novitiate at the Engakuji Rinzai Zen monastery in Kamakura.