Daniel Paul "Dan" Haseltine is an American singer best known as lead vocalist for Christian alternative folk rock group Jars of Clay. Haseltine has performed vocals, piano, accordion, percussion and most recently, melodica, while with Jars of Clay. He has had different artistic titles, including songwriter, producer, film composer, music supervisor and art designer. Haseltine is also the founder of the non-profit organization, Blood:Water Mission, where he currently sits as part of the board of directors. He is a regular writer and speaker about worship music, HIV/AIDS in Africa, social justice and church reform. Haseltine is also a regular columnist for Relevant Magazine, and has contributed articles to Moody, CCM Magazine, Christianity Today, World Vision, Campus Life and Beliefnet.