Aflac, the leading provider of voluntary insurance sales at the worksite in the U.S. announced that Chief Executive Officer Daniel P. Amos has been named to the Harvard Business Review's 2017 list of the 100 Best-Performing CEOs in the World, a distinction which he has earned the past three years. He is listed at No. 33 in 2017.

According to the Harvard Business Review, to compile the list of the world's best-performing CEOs, they began with the companies that at the end of 2016 were in the S&P Global 1200, an index that reflects 70 percent of the world's stock market capitalization and includes firms in North America, Europe, Asia, Latin America and Australia. They identified each company's CEO but, to ensure that they had a sufficient track record to evaluate, they excluded people who had been in the job for less than two years. All told, 898 CEOs from 887 companies were evaluated. To calculate the final ranking, the overall financial ranking (weighted at 80 percent) was combined with two environmental, social and governance rankings (weighted at 10 percent each).

Amos landed at No. 19 out of the 898 CEOs studied in the financial ranking. Since he became CEO in 1990, revenues have soared from $2.7 billion annually to more than $22.7 billion as of Dec. 31, 2016. He is the second-longest tenured CEO in the Fortune 200.