Cornelius Edward Ryan was born on 12-03-1896, in Boston, Massachusetts, 
the son of Thomas B. Ryan and Julia B. born Driscoll. Following high school, he entered the University of Connecticut in Storrs, 
Connecticut, where he was active in football and basketball squads and reached the rank of first sergeant in the Reserve Officers’ Training Corps.
Ryan graduated with Bachelor of Science degree in summer 1917 and was commissioned second lieutenant in the Infantry Branch on 15-08-1917. Cornelius was then assigned to the 49th Infantry Regiment at Syracuse, New York and spent several next months with intensive training for combat deployment in France. His regiment was later attached to the 83rd Division 
and embarked for France in July 1918, where it was stationed in the rear area, providing replacement personnel for front-line units. While in France, Ryan participated in the training of Polish legions and returned to the United States in early 1919.
Edward Ryan remained with 49th Infantry 
under command of Major-General Henry Rodolph Davies 
at Fort Snelling, Minnesota until May 1921, when he was transferred to 34th Infantry Regiment at Camp Meade, Maryland. After one year there, he was sent to Fort Benning, Georgia, where he assumed duty as assistant to the post logistics officer. Ryan spent three months in this capacity and entered the Company Officers’ Course at local Army Infantry School in September 1922.
Following the graduation in June 1923, he returned to Camp Meade 
, where he completed the Tank School. Ryan was then sent to Cambridge, Massachusetts for a one-year course at Massachusetts Institute of Technology.
In August 1927, Ryan was ordered to Versailles, France, where he was detailed to the Centre D’Études des Chars de Combat (The Center for Combat Tank Studies a.k.a. Tank School). He graduated a few months later and joined the 507th French Tank Regiment 
in Metz, where he served as observer for two months and then returned to the United States.
Ryan was sent to the University of California, Berkeley in early 1930 and assumed duty as assistant professor of military science & tactics. He spent six years in this capacity and subsequently joined 23rd Infantry Regiment 
at Fort Sam Houston, Texas. Ryan remained there until September 1938, when he entered the course at the Army Command and General Staff School at Fort Leavenworth, Kansas. 
Upon the graduation as major in June 1939, Ryan was appointed an instructor in the Tank section at the Army Infantry School at Fort Benning, Georgia. He served consecutively under Brigadier Generals Asa Leonidas. Singleton, 
Courtney Hodges, 
Omar Bradley 
and Leven Cooper Allen 
and was appointed Chief of the Automotive Section. While in this capacity, he was promoted to Lieutenant Colonel in August 1940 and to the temporary rank of colonel on 24-12-1941.
During the first years of the United States participation in the World War II, Ryan participated in the training of Army officers with his automotive section until February 1943, when his services were requested by his old superior, Lieutenant General Courtney Hodges, now commanding General of Third United States Army 
at Fort Sam Houston, Texas. The Third Army was tasked with the training of replacements, and Ryan as its assistant chief of staff for operations, had the opportunity to proved again his skills during the planning of training. For his service at Army Infantry School and with Third Army, Ryan was decorated with two Army Commendation Medals.[2][5][3]
In June 1943, he was sent to the European Theater of Operations, when he was requested by his another old superior from Infantry School, General Omar Bradley. Ryan was attached to the headquarters, Twelfth United States Army Group as assistant chief of staff for military plans and training. He served in this capacity during the Battle of Normandy, Ardennes Campaign, Rhineland Campaign and Western Allied invasion of Germany and was promoted to the temporary rank of Brigadier General on 07-01-1945.
For his service in this capacity, Ryan was decorated with Distinguished Service Medal, 
Legion of Merit 
and Bronze Star Medal. 
His service was also recognized by the Allies and he was decorated with: Order of the British Empire; 
Legion of Honour and Croix de Guerre with Palm 
by France; Order of Adolphe of Nassau 
and War Cross by Luxembourg; Order of Leopold II 
and Croix de Guerre with Palm by Belgium; Order of Orange-Nassau by the Netherlands; and War Cross by Czechoslovakia. 
In August 1945, three months after the surrender of Nazi Germany, Ryan was transferred to the headquarters, Fifteenth United States Army under General Leonard Townsent Gerow. 
He served under him and later under General George Smith Patton 
as assistant chief of staff for military plans and training during the occupation of Germany in North Rhine-Westphalia, the Rhineland-Palatinate and Saarland.
Ryan was ordered to Berlin in May 1946 and assumed duty as deputy commanding General, Berlin Sector under Major General Frank Augustus Keating 
. He remained in that capacity until October that year, when he was ordered to Frankfurt am Main for duty as commanding general, General Headquarters, U.S. Forces, European Theater.
Ryan was transferred back to Berlin in May 1947 and assumed duty as commanding General, Berlin Sector with additional duty as deputy military governor and U.S. Representative on the Berlin Allied Kommandatura. While in this capacity, he was co-responsible for the governing of the city of Berlin, which was divided in four sectors occupied by Great Britain, France, United States and Soviet Union and took part in the regular meetings despite the worsening political situation. For his service in postwar Germany, Ryan received his third Army Commendation Medal. 
Ryan returned to the United States in September 1947 after 51 months of overseas duty and assumed duty as chief of staff, V Corps under Major General Stafford LeRoy Irwin 
at Fort Bragg, North Carolina. He was ordered to Camp Breckinridge, Kentucky in October 1948 and assumed duty as assistant division commander, of the WW2 famous 101st Airborne Division 
under Major General William Richard Schmidt. 
Ryan participated in the training of airborne units and ultimately relieved Schmidt as division commander in August 1950. He continued to train replacement airborne personnel for combat units in Korea until May 1951 and received his fourth Army Commendation Medal based on the letter from the U.S. Army Assistant Chief of Operations, Lieutenant General Maxwell Davenport Taylor.
He gained the reputation of great troops trainer and got the attention of commanding General, Second United States Army, James Alward Van Fleet, 
under which 101st Airborne Division fell under. Van Fleet was meanwhile ordered to Korea to command the United States Eighth Army and did not forget Ryan’s qualities. Van Fleet was not fully satisfied with the progress of Korean Military Advisory Group under Brigadier General Francis William Farrell 
and asked War Department for Ryan as Farrell’s replacement.
Ryan was ordered to Korea and assumed duty as Chief, Korean Military Advisory Group (KMAG) on 07-07-1951. His main task was to transform the Republic of Korea Army (ROKA) into a fighting force capable of carrying its weight in United States Eighth Army and make Korean Military Advisory Group responsive to the needs of the Republic of Korea Army. He developed strong relation with his counterparts, Generals Lee Chong-chan 
and Paik Sun-yup 
and worked together on plans to make a new army.
Under his leadership, KMAG transformed into a first-class military training and advisory mission. Under his experienced direction, KMAG then inaugurated a series of training and organizational reforms that laid the basis for a Korean Army capable of fighting the Chinese on more equal terms. Ryan served in Korea until mid-May 1953, when he was succeeded by Brigadier General Gordon Byron Rogers. 
For his service with KMAG, Ryan was decorated with his second Army Distinguished Service Medal and also received Order of Military Merit (South Korea) Ulchi with gold star and Order of Military Merit (South Korea) Taiguk with silver star by the Republic of Korea. He was promoted to Major General in November 1952.
Following his return stateside and two-month leave, Ryan was ordered to Fort Dix, New Jersey, where he assumed command of 9th Infantry Division with additional command of that installation. His new command was responsible for the training of replacements for troops both in Europe and Korea. The 9th Infantry Division was stationed at Fort Dix until May 1954, where it was transferred to Fort Carson, Colorado and replaced by newly activated 69th Infantry Division.
Ryan assumed command of 69th Infantry Division in May 1954 and was again responsible for the training of replacements until November 1955, when he was ordered to Paris, France for duty as Chief of the Military Assistance Advisory Group there. He served in that capacity until June 1957, when he retired after almost 40 years of active duty. The Government of France upgraded his Legion of Honour 
from Officer grade to Commander for his service in Paris.
Death and burial ground of Ryan, Cornelius Edward.
Ryan’s retirement did not last long, and he was offered the full-time job of executive vice chairman of the Presidents Committee on Governments Contracts by President Dwight Dwight David “Ike” Eisenhower 
in October 1957. While in this capacity, he was responsible for eliminating employment discrimination on government contracts. Ryan visited a number of CEOs of important federal contractors, including Alcoa, General Electric and Bethlehem Steel.
Cornelis Ryan later settled in Menlo Park, California, where he died at the Veterans Administration Hospital after long illness on 06-06-1972, aged 76. Ryan was buried with full military honors at Arlington National Cemetery, Virginia together with his wife, Inez B. Ryan. They had two sons, both West Point graduates, Major Walter Joseph Ryan and Captain Edward F. Ryan, and one daughter Elizabeth.
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