Challenge #1: Komal Ahmad is the founder and CEO of Copia, a for-profit company working to eradicate hunger and reduce food waste by using technology to redirect surplus food from businesses and events to feed those in need. Copia's fleet of professional Food Heroes deliver excess food to veterans agencies, local shelters, and nonprofits serving the hungry.

Challenge #2: Ezekiel Emanuel is vice provost for global initiatives, the Diane v.S. Levy and Robert M. Levy University Professor, and chair of the Department of Medical Ethics and Health Policy at the University of Pennsylvania. He was the founding chair of the Department of Bioethics at the National Institutes of Health until August 2011.

Challenge #3: Reverend Jeffrey Brown is a nationally recognized leader and expert in gang, youth and urban violence reduction and coalition building. He is the founder of RECAP (Rebuilding Every Community Around Peace), a new national organization organized to assist cities build better partnerships between community, government and law enforcement agencies to reduce gang violence.

Challenge #4: Shari Davis is responsible for the strategic development and management of network building and launching new high impact participatory budgeting processes for Participatory Budgeting Project (PBP). She joined PBP staff after nearly 15 years of service and leadership in local government.

Challenge #5: J.T. Reager is an earth scientist at the NASA Jet Propulsion Laboratory in Pasadena, California. He studies the earth's water cycle with a particular focus on hydrologic extremes, sea level rise and water resources. He joined JPL in 2014. He has a PhD in earth system science from the University of California, Irvine, an M.S.