Karen Mills, President Obama’s head of the Small Business Administration, has announced that she will be stepping down after four years on the job.

“I want to thank Administrator Mills for her outstanding work on behalf of America’s small business owners and entrepreneurs,” Obama said in a statement. “I asked Karen to lead the Small Business Administration because I knew she had the skills and experience to help America’s small businesses recover from the worst economic crisis in generations – and that’s exactly what she’s done.”