William O'Brien, MD
(888) 227-3762
500 Merrimack St., Lawrence, Massachusetts, 01843
Business hours
| Monday | 8:30am to 5:00pm |
| Tuesday | 8:30am to 5:00pm |
| Wednesday | 8:30am to 5:00pm |
| Thursday | 8:30am to 5:00pm |
| Friday | 8:30am to 5:00pm |
| Saturday | - |
| Sunday | - |
About us
William O'Brien is a healthcare provider with Mass General Brigham who is committed to delivering compassionate, patient‑focused care.