He was a Greek theologian, university professor and member of the Academy of Athens. He studied at Rizarios School (1900-1903) and the Theological School of Athens (1904-1908). Between 1911 and 1914 he studied Hermeneutics, Theology, Philosophy and Pedagogy at the University of Leipzig.

Louvaris was influenced by the phenomenology of Husserl, was opposed to historical materialism and remained faithful to his professors' positivism, Wilhelm Dilthey and Sprangke, and thus to Immanuel Kant.
Back to Greece, he had a particular impact to the the so-called Circle of Heidelberg (Ioannis Theodorakopoulos, Konstantinos Tsatsos, Panagiotis Kanellopoulos), while his students were called "louvaristas". He was the pioneer of theologico-psychology studies and the one  introduced the term "psychology of religion" or "theologico-psychology".

He served as Minister of Education during the third occupation government of I.Rallis (04.07.1943 to 12.10.1944), after the intense pressure of Archbishop Damaskinos.