Charlotte Joko Beck, died June 15, 2011 at 7:30 a.m., at age 94. She was not a member of the White Plum Asanga, but she did recieve transmission from Maezumi Roshi and several of her dharma successors are members of WPA.
The following is from the Prairie Zen Center website:
Charlotte Joko Beck was a renowned Zen teacher, co-founder of the Ordinary Mind Zen School and former head of the San Diego Zen Center. In the 1960s she trained under Hakuun Yasutani Roshi and Soen Nakagawa Roshi. In 1983 she became the 3rd Dharma heir of Hakuyu Maezumi Roshi of the Zen Center of Los Angeles. Joko semi-retired in 2006 and moved to Prescott, Arizona. She passed away on June 15th, 2011 at the age of 94. She was the author of two books: Everyday Zen: Love and Work. 1989. Harper Row. ISBN 0-06-060734-3.
Nothing Special: Living Zen. 1994. Harper Row. ISBN 0-06-251117-3.
A chapter discussing her work can be found in L. Friedman's book, Meetings with Remarkable Women: Buddhist Teachers in America. 1987. Boston & London: Shambhala.
Go here to read WPA President Shishin Wick's memorial to Joko.