Google is losing its CFO, George Reyes, who has decided to retire, the company said Tuesday.

There doesn't appear to be any controversy associated with Reyes' departure, which is expected to happen by the end of the year. In fact, Reyes will assist Google in the search for his replacement, Google said.

In a press release, Google CEO Eric Schmidt expressed admiration for Reyes and said the company will miss "his thoughtfulness, good humor, and wisdom."

As Google's CFO for the past five and a half years, Reyes oversaw critical financial events at the company, including its unorthodox and closely watched initial public offering as well as the challenges and complexities of a global, fast-growing Internet company.

In the statement, Reyes called his Google tenure "an extraordinary ride," and Google co-founder Larry Page praised him for helping Google balance financial discipline and entrepreneurial culture.

Reyes came to Google in 2002 from ONI Systems, where he served as interim CFO. Earlier, he spent 13 years at Sun, where held various high-ranking finance jobs.