[1] Greenbaum carries out his philanthropic activities through his foundation, the Greenbaum Foundation,[4] which is registered in West Hollywood, California, and currently focuses on alleviating suffering, with particular emphasis on human rights, women and girls, non-human animals, and promoting whole foods plant based diets.
"[6] Greenbaum has stated that he was initially interested in a career as a human rights lawyer to fight injustice.
[6] After the successful sale of Access Long Distance, Greenbaum's finances grew to $133 million.
He gradually became more interested in the problem of human trafficking, and donated to a number of charities to combat it.
In 2007, he discovered Tostan, that he praised for trying to engender behavior change in communities to have a long-term impact on issues ranging from female genital cutting to child marriage.
He committed to spending down the Greenbaum Foundation and at least 85% of his personal holdings to charitable causes before his death (this would amount to over $100 million), and the remainder soon thereafter.