Pius XII has his boosters, and his critics. But he has at least one big fan from my own backyard — who also just happens to be Jewish:

At home here on Long Island, he is Gary L. Krupp, medical equipment dealer, now retired after a career of ups and downs. He shares one car and a small house in a no-frills neighborhood with his wife, Meredith, and wryly describes himself as “an average schlemiel, just a Jewish kid from Queens.”

At the Vatican, he is known as Commendatore Gary Krupp, Knight Commander of the Pontifical Equestrian Order of St. Gregory the Great. For short, the Swiss Guard and cardinals address him as “Your Excellency.”

It is a compelling tale in itself: how Mr. Krupp became only the seventh Jewish papal knight in history, dubbed by Pope John Paul II in 2000 for persuading American manufacturers to donate $12 million worth of high-tech medical equipment to an Italian hospital.

But the more curious and complicated story is the transformation Mr. Krupp has undergone since. With no previous training or special interest in history, he has emerged as the Vatican’s most outspoken Jewish ally in a heated debate at the crux of tensions between Roman Catholic and Jewish leaders and historians: whether Pope Pius XII, the pontiff during World War II, did as much as he could have to save Jews from the Holocaust.

Mr. Krupp, 62, has raised enough money through the Pave the Way Foundation, a nonprofit organization he founded in 2002, to travel the globe, hire researchers to scour historic documents, sponsor a three-day symposium in Rome and publish four editions of a glossy, illustrated volume of evidence supporting his view that Pius XII spared no effort to save the lives of persecuted Jews.

He has pressed his case in a recent op-ed article for The New York Post, and in interviews with conservative Catholic television programs and Web sites, which have cited him as an expert on Pius.

And in a special audience at the papal summer residence in September 2008, Pope Benedict XVI thanked Mr. Krupp for bringing attention to “what Pius XII achieved for the Jews.”

There’s more at the Times link.