See biography by M. B. Stern (1953).
Born Miriam Florence Folline, she was a descendant of a noble Huguenot family, from which she took the title late in life, Baroness de Bazus. She began her career and was married four times. She left her second huband, the anthropologist Ephraim Squier to marry publisher Frank Leslie. When he died in 1880, leaving his business badly involved, she took it in hand and put it on a paying basis, even going so far as to having her name legally changed to Frank Leslie. She later effected a reorganization of the business, and became its president. The circulation of the Popular Monthly increased 200,000 in four months under her management.
In 1902 she sold out all her publishing interests. While abroad in 1891, Mrs. Leslie married William Wilde, a brother of Oscar Wilde, but two years later was divorced from him. She was also supposed to have been married several times before meeting Mr. Leslie.
She was the author of: