originalist
/əˈrɪdʒɪn(ə)lɪst/ /əˈrɪdʒɪnəlɪst/noun
1A person who acts, thinks, or otherwise behaves in an original way. Now rare.
2 US. An advocate or proponent of originalism.
Origin
Mid 19th century; earliest use found in The Monthly Review. From original + -ist.