Ignatius Press is the premiere Catholic book publisher. Founded by Father Fessio who is still active in running the company, it has the largest distribution network, the largest number of customers, and makes the most amount of sales, by far. They not only sell books but also plenty of Catholic DVDs as well, especially on saints. Their mail order catalog is very beautiful, and it's always fun to delve into. They have published several books on and written by the popes, most notably, Pope Benedict XVI. Lastly, they publish Michael O'Brien, who is perhaps the most successful and popular Catholic fiction writer living today.