Stephanie Thomes and Johan Grahn have joined Allianz Investment Management US, Allianz Life Insurance Company of North America announced Wednesday.

Thomes is vice president, head of alternative investments, and Grahn is assistant vice president, portfolio management. In their respective roles, Thomes and Grahn will assist with management of more than $100 billion of insurance assets for Allianz Life, Allianz Global Corporate & Specialty and San Francisco Reinsurance.

Thomes will be responsible for leading AIM’s efforts in growing the alternative assets portfolio. Previously, she was with Black River Asset Management, where she was a director in private equity risk management.

Grahn will be responsible for managing the variable annuity fund of funds portfolio as well as the development and communication of investment strategies. Previously he was with MetLife where he managed a team of analysts overseeing more than $30 billion of dynamically managed multi-asset portfolios and served as a portfolio manager on several fund-of-fund portfolios with assets totaling approximately $50 billion.