Who is credited with originating ancient Greek atomism?

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Bronze bust of Epicurus with a full beard and draped clothing, displayed on a round inscribed base at the National Archaeological Museum of Naples. — Atomism Epicurus, bronze bust from a Greek original, c. 280–270 bce; in the Museo Archeologico Nazionale, Naples.

The Greek philosopher Leucippus is credited with originating the theory of atomism.

While it is often difficult to distinguish his specific contributions from those of his most famous pupil, Democritus, ancient authorities such as Aristotle and Theophrastus identified Leucippus as the founder of the doctrine. Leucippus proposed that the physical world consists of two fundamental principles: empty space (the void) and filled space (atoms). He theorized that these atoms are indivisible, constantly in motion, and that their collisions and regroupings form the various compounds observed in the cosmos. Democritus subsequently built upon these foundations to develop a comprehensive system explaining the phenomena of the visible world.12