Atlantic Trust has expanded the roles of managing directors Sid Queler and Bruce Katz as part of an ongoing growth strategy.

Queler has been promoted to national director of business development and Katz to director of strategic alliances.

Based in Boston Queler will spearhead business development planning and initiatives and play a key role in the firm’s recruiting efforts for new business development professionals.

Katz, who is based in New York, will strengthen existing relationships and identify and develop new opportunities for business alliances with external firms.

Atlantic Trust’s clients include high net worth individuals and families who have liquid assets ranging from $5 million to $100 million.

It has approximately $17 billion in assets under management.