In the early 2000s, the endowment had exceeded US $1 billion and the College decided more complex investment management was required to continue to grow the fund.

[3] The Investment Office has a staff of nine people who directly oversee the management of the College's portfolio.

Advising the staff are three Advisory Committees, made up of Williams alumni or parents with financial expertise.

The Co-Chairs of the Marketable Assets Advisory Committee are Ole Andreas Halvorsen and Elizabeth Robinson.

There are ten asset classes: global long equity, global long/short equity, absolute return, venture capital, buyouts, real assets, real estate, investment grade fixed income, non-investment grade fixed income, and cash.