John Patrick "Jack" Ryan, Sr., KCVO, (Hon) is a fictional character by Tom Clancy who appears in many of his novels and their respective film adaptations. The character is born in Baltimore in 1950 and grows up there. He earns an NROTC commission in the Marines at Boston College. Medically retired following a helicopter crash, he works as an investment broker. He meets and marries Caroline "Cathy" Mueller, a medical student and later an ophthalmic surgeon, with whom he has four children. He returns to academia eventually accepting a position at the U.S. Naval Academy. Later he is recommended to the CIA, eventually spending a short period there writing a position paper as well as developing a counter-espionage mechanism. He returns to the Academy and while on a history research trip to London, he interrupts an assassination attempt on the Royal Family. After his return to the States, he eventually accepts a position with the CIA. He rises rapidly through the ranks in a variety of covert operations against the USSR, eventually becoming the Deputy Director of the Central Intelligence Agency. As DDI, he begins having political battles which eventually lead to him becoming President in two separate terms where the international confrontations are now from the Pacific area.