Who is Sarton Bander from Foundation and Earth and what is their importance?

Bander is the owner of an estate on Solarius, Bander greets Travize and his party upon their arrival. It's Bander who explains that Travize is the first "settler" to visit their planet in thousands of years. Bander is neither male nor female, but is "whole." Bander has telekinetic powers and immediately disarms Travize and says the Far Star could have been destroyed as easily. Bander later explains that his brain transducers so that he can harness heat to power his telekinetic abilities. Bander talks with the tree for some time, giving them a tour of his underground mansion. Then, he reveals to them that he should have killed them the moment they arrived and that he will do so now. Bliss blocks the exit of energy from his mind for a split second, resulting in his death.