There is another firm that deals exclusively in index funds for the long term, Portfolio Solutions....
Low Fee Investment Manager, Low Cost Investment Advisor | Portfolio Solutions Their cost is about 1/2 that of Vanguard Asset Management..... 70 basis points vs. 34 basis points for accounts over 1 million (assuming you are looking for portfolio management). For accounts under 1 million, the fee is based on a different percentage of assets under management. They do not hold your funds... Schwab does. They also have a fiduciary responsibility.
Very similar to Vanguard, in fact 1/2 their portfolios are Vanguard products. They also use Dimensional Index Funds and Index ETFs.
Worth a look if you are seeking help with portfolio management. If not, it's hard to beat Vanguard’s cost if you are managing your own portfolio....especially if you purchase Admiral Shares.