I’m interested in putting together a list of famous converts to the Catholic Church because I think that may provide a qualitative measure of the movement toward Rome.
One of my pet theories is that although the Catholic Church loses a large number of members each year to non-Catholic sects (it is said that the second largest religious group in the US is ex-Catholic), these emmigrants are largely ignorant of or indifferent to their faith at the time of their departure.
Conversely, those who are entering the Catholic Church tend to be highly knowlegable about both the denomination they are leaving and the faith they are embracing. No one becomes a Catholic in ignorance; to the contrary, they have often undergone a lengthy period of soul-searching as they have wrestled with and become convinced about theological issues that they initially wanted to disprove.
Here is my initial list (in no particular order):
John Henry Newman
I look forward to your additions.