The Teachers Insurance and Annuity Association of America-College Retirement Equities Fund (TIAA, formerly TIAA-CREF), is a Fortune 100 financial services organization that is the leading provider of financial services in the academic, research, medical, cultural and governmental fields. TIAA serves over 5 million active and retired employees participating at more than 15,000 institutions and has $1 trillion in combined assets under management with holdings in more than 50 countries .