Karen Klein, MD Pediatrician, Harvard Vanguard Medical Associates Image Phone 617-355-5470 Fax 617-859-5059 Email Email Me NPI 1154309235 Print Profile Locations Massachusetts Harvard Vanguard Medical Associates Massachusetts Listen Karen Klein, MD Pediatrician, Harvard Vanguard Medical Associates Medical Services Programs & Services General Pediatrics Languages English Locations Massachusetts Harvard Vanguard Medical Associates Massachusetts