Altchek went to medical school at Cornell and worked initially for the ATP and NBA, specializing in shoulder issues, before becoming the Mets' team doctor at the Hospital for Special Surgery in Manhattan. His specialization includes elbow and knee injuries as well, meaning he's dealt with some of the Tommy John surgeries the Mets have had in recent years.
In April, he performed the operation on Bobby Parnell. Last August, he operated on Jeremy Hefner.
He's also performed anterior capsule surgery, on Tim Byrdak last year and Johan Santana in 2010.
Dr. Altchek has been the Mets' director of medical services since November of 1991 (NY Times, 4/12/92).