Taber MacCallum is an American entrepreneur who is the co-founder and co-CEO of Space Perspective, a human spaceflight company planning to take people and payloads to the edge of space by balloon, and the former chairman of the Commercial Spaceflight Federation (CSF). He is co-founder and former CTO of World View Enterprises, a stratospheric balloon company using its uncrewed Stratollite for remote communications and sensing. MacCallum was also a founding member of the Biosphere 2 design team and a crew member from the original two-year mission inside the materially-closed ecological system.