 
  Robert C. O'Brien is the co-founder and chairman of American Global Strategies LLC. He was the twenty-seventh United States national security advisor from 2019–2021. O’Brien served as the president’s principal advisor all aspects of American foreign policy and national security affairs.
 
 
   
 
   
   
 
 
   
 
 
   
 
   
 
   
 
   
 
 
 
 
 
 
 
 
 
 
   
 
   
 
  