Washington, D.C. ? The Smithsonian Institution announced Monday that its top official, Secretary Lawrence M. Small, has resigned amid criticism about his expenses.

Small resigned over the weekend, and the decision was unanimously accepted Sunday by the Smithsonian’s Board of Regents.

An internal audit in January found that Small had made $90,000 in unauthorized expenses, including private jet travel and expensive gifts.

The audit also found that Small charged the Smithsonian more than $1.1 million for use of his home since 2000. The housing expenses included $273,000 for housekeeping, $2,535 to clean a chandelier and $12,000 for service on his swimming pool.

On Thursday, the Senate approved freezing a proposed $17 million increase in funding for the Smithsonian, citing Small’s excessive compensation and spending.

Small was to earn $915,698 this year in total compensation – more than double what he earned during his first year as secretary in 2000.