Robert Gould, head of wealth management at Brown Brothers Harriman, will retire next month.

The decision to leave was made by Gould, a 30-year veteran of the low-profile bank.

Two partners, Richard Witmer and Charles Izard, will succeed him, a Brown Brothers spokesman confirmed.

BBH has $45 billion in assets under management. Clients must have a minimum of $5 million in investable assets, although an average client’s assets are closer to $20 million.

The firm charges clients 100 basis points for the first $5 million of assets under management and break points after that, FWR reported in a profile of the firm published earlier this year.

The 192-year-old firm is the oldest and largest privately-owned bank in the US. It has six wealth management offices located in New York, Boston, Philadelphia, Chicago, Charlotte and Wilmington.