Sandy Gallin, who once was Barbra's talent manager - along with (then) A-list celebs Michael Jackson, Cher, Olivia Newton-John, Dolly Parton, Neil Diamond, Marvin Hamlisch, Lily Tomlin and many others - is in an LA Hospital 'fighting for his life' according to TMZ. The 76 year old mogul went late last week to the UCLA Medical Center, in the ICU, after suffering a relapse of multiple myeloma, a blood disease. Many of his friends (including David Geffen and Calvin Klein) have visited with him the past few days, some have said it looks 'really bad'.
Not sure how much he did for Streisand, or when they worked together or parted ways.
Here's some additional info on Gallin, though (don't know how much is true):