Who played a major role in transforming the Continental Army into a professional military force as noted in the biography, A Young Patriot?

Friedrich von Steuben, a Prussian military expert, played a major role in transforming the ragged, miserable army into a precision fighting force with a uniform military code for conduct. Even Joseph was surprised by what happened; the Continental Army that had hidden in the countryside becomes a professional army (although comprised largely of unpaid volunteers).