1894 – 1966
Georges Lemaître (1894–1966) was a Belgian Catholic priest, physicist, and astronomer who first proposed what became known as the Big Bang theory, publishing his hypothesis of the 'primeval atom' in 1927. He independently derived the expanding universe relation later associated with Hubble and argued forcefully that scientific cosmology and religious doctrine operate in separate, non-competing domains. His work fundamentally shaped both modern physical cosmology and twentieth-century discussions of the relationship between science and theology.
Proposed the primeval atom hypothesis (Big Bang theory) in 1927, predating Hubble's observational confirmation
Independently derived the linear redshift-distance relation (Hubble's law) from Einstein's field equations
Articulated a principled separation between scientific cosmology and theological doctrine, arguing neither can adjudicate the other
Served as President of the Pontifical Academy of Sciences (1960–1966)
Pioneered numerical methods in relativistic cosmology and early computational approaches to astronomical calculation