American Zen : The Wisdom of an American Zenji is a lovely book about Rama - Dr. Frederick Lenz by Y. Ohta. Rama was a true Zen master who embodied the teachings of original Zen. In Ohta’s book, which she illustrated herself, she captures the wisdom, stillness, and humor of the American Zen master in a series of short, pithy chapters.
If you want to sense the essence of who Rama was, and experience the essence of Zen, you will enjoy this book. It’s on Amazon in print and ebook.