Callista Mediasse

Doctor Callista Mediasse is the founder and leader of the Expansion Society of Hesperia, as well as being a prominent scientist in her own right.

History
Not much is known about Callista's origins, but from what is known it is understood that Callista grew up in a normal home. Her parents named her after the Hesperide of Enlightenment because they felt that she was destined for great things. She took to science instantly like a fish to water as it seemed she was born with a knack for understanding all manner of things uncannily quick. She skipped a grade in school, graduating early at the top of her class, and then went on to graduate top of her class from university with multiple advanced degrees. While there she met some of the scientists who would one day stand beside her as either fellow founders or members of the Expansion Society.

Expansion Society
While at university, Callista saw that scientists were learning and putting the knowledge to good use, but she also saw that they were rarely unified. It was then that she and her close colleagues thought up the idea of the Expansion Society of Sciences, a place where scientists could meet, discuss, and work together for common goals and expand the pursuit of knowledge throughout Hesperia.

Chrono
When the Expansion Society membership exploded and chapters started appearing throughout Hesperia, Callista had the honor of meeting the demigod Chrono, who had control over time. He blessed her with immortality so she could continue her work with the Society. This may be the reason she has lived for so long, well past the lifetimes of her fellow founders.