Maas was educated at public and private schools and the gymnasium at Arnsberg, Westphalia, the Jesuit scholasticates at Manresa, New York, Woodstock College, and Manresa, Spain.
He attended Woodstock College, Galt Collegiate Institute and Osgoode Hall, articling with Osler, Wink & Gwyn.
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It holds the Woodstock Theological Center Library, the remnants of the library of Woodstock College and one of the country's leading Catholic theological libraries.
He earned degrees in English literature and philosophy from Woodstock College and studied theology at the University of Louvain in Belgium and at the University of Valencia in Spain.