Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.Community organizing expert and Harvard professor Marshall Ganz speaks at Sojourners' Pentecost 2008: Training for Change conference.