Vegapunk

Doctor Vegapunk (Dr.ベガパンク, Dokutā Vegapanku) is the leading scientist in the employment of the Marines. His work includes discovering the secrets and uses of Seastone, the secrets of how Devil Fruit powers work, and various other scientific achievements.

Abilities and Powers
Vegapunk is a genius scientist whose scientific expertise is said to be 500 years ahead of the current timeline.

Through his research he discovered ways of allowing Marine ships to pass through the Calm Belts by covering the bottom of the ships with Seastone. He also discovered how exactly Devil Fruit powers are transferred over to a user and was the discoverer of the method of adding such power to objects.

He is also the one who modified Bartholomew Kuma into a cyborg.