Reines replaces Frank Russo, who resigned Thursday.
Commissioner Peter Lawson Jones said: "I had the privilege of serving with Dave during my first three years as county commissioner. He's an all star -- diligent, thoughtful, public-policy oriented and highly ethical. Our county is fortunate indeed that Dave is willing to undertake this critical assignment of righting the Auditor's Office and restoring public faith in the agency."
Since July 2007, Reines has served as Chief Development Officer of the Center for Families and Children, a nonprofit community services agency.
A former County Administrator, Reines has held several positions in the public and nonprofit sector. He served as Executive Vice President of the Greater Cleveland United Way Services from 1997 to 2001, until being named County Administrator.
After leaving the county administrator's office in 2004, Reines was the Executive Vice President for Workforce and Economic Development at Cuyahoga Community College.
County Administrator Jim McCafferty said the commissioners selected Mr. Reines after reaching out to the business and nonprofit community for recommendations and assistance.
"We needed to work quickly so that the critical functions of the Auditor's office continued uninterrupted," McCafferty said.
"Reines has the unique blend of governmental, high-level management and fiscal experience as well as the integrity we needed. Dave was gracious enough to accept, knowing that it is a short-term assignment."
Reines said, "was approached by Commissioners Tim Hagan and Peter Lawson Jones, for whom I have the utmost respect. I told them I would be willing to help if I could. I realize it is a short-term job, and that there are also substantial challenges."
After Jan. 1, 2011, the elected County Auditor's office will be eliminated.
A Chief Financial Officer, to be appointed by the Executive and approved by the County Council, will assume all of the Auditor's statutory duties.