Via ESPN:

Longtime ESPN Baseball analyst Peter Gammons suffered an aneurysm in his brain Tuesday morning near his home on Cape Cod, Mass. He was airlifted to a Boston hospital, where he is currently undergoing surgery.

Gammons, 61, is probably the best-known baseball writer of his generation, first with the Boston Globe, beginning in 1969, then for Sports Illustrated, before joining ESPN in 1990.

UPDATE: Gammons is out of surgery and resting in intensive care, according to ESPN.

Via MLB.com: "He's a good friend and this was terrible, terrible news," Red Sox broadcaster and former player Jerry Remy said during the Tuesday night Sox-Mets broadcast on NESN. "Obviously, our thoughts and prayers are with Peter."