Tiedemann Wealth Management is expanding its US footprint through a "definitive agreement" with the wealth advisory firm Presidio.

Tiedemann Wealth Management has agreed to "combine firms" with Presidio Capital Advisors, the San Francisco, CA-based wealth advisor, according to an announcement by the former firm.

Tiedemann said it will now advise on approximately $13 billion, with offices in New York, San Francisco, Dallas, TX, Palm Beach, FL, Wilmington, DE, and Washington, DC.

Michael Tiedemann and Craig Smith will remain as chief executive and president of the firm, respectively. 

"Importantly, Presidio provides us with additional very experienced investment talent and resources, increased pricing power with investment managers and service providers, and an enhanced ability to continue to invest in talented people, systems and technology," Tiedemann said in the announcement.