Below are a few of the podcasts found on the internet by simply typing in the persons name and the word podcasts.
Again, try keying in the person's name and a keyword such as "martin luther king" nonviolence or simply the name "leymah gbowee".
Check the sites for additional links.
"The concluding session of the 12th World Summit of Nobel Peace Laureates held in Chicago on April 25, 2012. Panelists include His Holiness the Dalai Lama, President Mikhail Gorbachev, Professor Jody Williams and Professor Muhammad Yunus."