John Grunsfeld
![John Grunsfeld](https://planetary.s3.amazonaws.com/web/assets/pictures/_2400x1576_crop_center-center_82_line/20150204_john-grunsfeld.jpg 2400w, https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x788_crop_center-center_82_line/20150204_john-grunsfeld.jpg 1200w, https://planetary.s3.amazonaws.com/web/assets/pictures/_768x504_crop_center-center_60_line/20150204_john-grunsfeld.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x378_crop_center-center_60_line/20150204_john-grunsfeld.jpg 576w)
Accelerate progress in our three core enterprises — Explore Worlds, Find Life, and Defend Earth. You can support the entire fund, or designate a core enterprise of your choice.
Give TodayKnow the cosmos and our place within it.
Empowering the world's citizens to advance space science and exploration.