Houston Controller Chris Hollins announced Monday that his office has opened a formal investigation into Mayor John Whitmire's senior advisor for financial integrity, former Houston Controller Chris Brown, following questions raised about Brown's role, work activity and use of taxpayer-funded resources.

The investigation comes after a Houston Chronicle investigation raised concerns about Brown's attendance records, supervision and job responsibilities while serving in a taxpayer-funded position within the mayor's office.

According to Hollins, the review will examine compliance with city policies, oversight and accountability measures, and whether taxpayers received appropriate value from the position.