Jan 11 (Reuters) - California State Teachers' Retirement System (CalSTRS) said on Thursday that its chief investment officer, Christopher Ailman, would step down in June, after over two decades in the role at the pension fund.

The CalSTRS investment portfolio has grown almost threefold to $317.8 billion as of Nov. 30, 2023 from $109.6 billion during his tenure, according to the company.

Ailman, who has been the CIO since October 2000, steered the fund through the internet bubble burst, the economic fallout from the Sept. 11 attacks, and the 2008 financial crisis. His term comes to an end on June 30.

Established in 1913, CalSTRS provides services to more than 1 million members and beneficiaries, making it one of the largest educator-only pension funds in the world. (Reporting by Pritam Biswas in Bengaluru; Editing by Shailesh Kuber)