Munro is Swedish, and worked for eight years for the Swedish government in the bureau of housing research. She then began her career as an advocate for the poor in Kenya, pressing for their right to housing as a staff member of Habitat and the head of African Housing Fund, an advocacy group for the homeless.
In 1999, upon Munro's retirement, she founded Jamii Bora along with 50 women beggars, loaning them twice as much as they agreed to save. it is the fastest-growing microfinance institution in Kenya in reaching the poorest. over the past seven years has expanded to sixty-one branches, serving more than one hundred and thirty thousand members. Munro aims to reach at least five hundred thousand by 2009.
Munro said she came to know the women after she and her husband, a Canadian, adopted first one boy who had lived on the street, then his two brothers, beginning in 1988. The New Yorker quotes her as saying, "It was a small seven-year-old boy who more or less adopted us....And then we later found his two brothers and adopted them. With a situation like that, like in all great love stories, in literature and in real life, you are a helpless victim, you know?"