Jim is survived by his wife, Sheryl, and his six children.
His work has typically carried a libertarian flavor, and his novel Voyage from Yesteryear also featured an economic/social system that was not only compatible with libertarianism, but was a plausible one for a technologically advanced society in which no one wants for anything material.
Jim was known for his penchant for underappreciated theories, especially in physics and cosmology. He was certainly fearless when it came to bucking the establishment view.
We're very sad to see him go.