Major General Count Albert-Marie Edmond Guérisse GC, KBE, DSO (5 April 1911 – 26 March 1989) was a Belgian Resistance member who organized French and Belgian escape routes for downed Allied pilots during World War II under the alias of Patrick Albert "Pat" O'Leary, purportedly the name of a peace-time Canadian friend.

Guérisse was born in Brussels, and qualified in medicine at the Université Libre de Bruxelles before joining the Belgian Army.

At Gibraltar, he joined the crew of a former French merchant ship, Le Rhin, which was later renamed HMS Fidelity and served in the Mediterranean on clandestine missions.

He secured entry into the British Royal Navy and was commissioned as Lieutenant Commander Patrick Albert O'Leary RNVR of French-Canadian origin.

Until April 1941, he was serving mainly as a conducting officer, escorting agents ashore in small boats through the surf, whilst the large vessel lay some distance offshore.

[Note 1] "O'Leary" immediately began his job : within a four-month period, he helped about fifty men escape from the prison of St Hippolyte du Fort, then moved them down the line back to England through the Pyrenees.

At this point the British decided it was time for Garrow to return to London, so "O'Leary" continued in command and expanded the reach of the escape line's operations.

In January 1943, the escape line was infiltrated and betrayed by a French turncoat, Roger le Neveu; Guérisse was arrested in Toulouse on 6 March 1943.

At the camp he witnessed the arrival of four other female SOE agents, Andrée Borrel, Vera Leigh, Diana Rowden, and Sonya Olschanezky, who were all executed and disposed of in the crematorium in an attempt to make them disappear without a trace, under the "Night and Fog" programme.

From its founding in 1956 until his death he served many terms as president of the Comité International de Dachau, and regularly gave the keynote speech at the May memorial ceremonies.