You will find the log in to Brown Brothers Harriman & Co by log on to their website https://www.bbh.com/en-us The log in box is in the upper right corner of the page, under client login. Click on client login, enter your user ID, password and login to your account.
If you would like to check about how to create an account with Brown Brothers Harriman & Co , you need to contact them, or pay them a visit. In order to find the location that is close to you, please check this link which contains all their branches and phone numbers : https://www.bbh.com/en-us/contact-us/office-locations
Brown Brothers Harriman (BBH) is a privately owned and managed financial services firm. They serve the most sophisticated individuals and institutions with expertise in Private Banking, Investment Management, and Investor Services. For more info, please visit their website, the link of the website is provided above.