He was born in Lima on February 27, 1851. His parents were Pedro Celestino Gárezon and María Thomas. He began his studies at the Naval Military College under the direction of Captain Pedro Panizo, from where he left as a Guardiamarina on March 30, 1867. He was Lieutenant of Frigate effective in April of the following year; Began its services on board when it was assigned to the frigate "Apurímac", then it went to the endowment of the steam "Tumbes" and of this one to the "Independence"; Also served on the corvette "Union" when this ship departed on commission to London. In the transport "Marañón" was professor of Naval School from August of 1873 until March of 1874, when it happened like Second Lieutenant to the "Huáscar" for the first time. The second would be the 31 of May of 1877, like Lieutenant First graduate, both times by short time. It was in the armored frigate "Independencia" commanded by Juan Guillermo More, from February 12, 1879, until the disgrace of Punta Gruesa, when he passed to "Huáscar" for the third time, to Angamos. In the legendary match, Grau and Ferré, Aguirre and Rodríguez were killed, and Lieutenant Palacios and Secretary Carvajal were wounded, and he had accidentally assumed command of the "Huáscar". With the conviction of the one who knows lost, but without surrender at all, ordered the sinking of the glorious monitor to avoid being captured by the invader, for which they should stop the march and open the valves. However, the Chileans boarded the ship anyway, avoiding revolver in hand, compliance with the order. Gárezon would suffer the same fate of many of the combat survivors. He passed the "Blanco" as a prisoner, then the "Coquimbo" transport to Valparaíso, remaining in the town of San Bernardo until December 20, 1979, when it was exchanged for the prisoners of the "Esmeralda" and the "Rimac". He was given the First Lieutenant's effectiveness on October 28 of that year, and was awarded a gold medal "for his assistance to the infamous memorable struggle against such superior enemy forces." In November of the same year it ascended to Captain of Corvette effective. On returning to Peru, he continued in the service, being named in 1880 in the position of second commander of the transport "Oroya" and later, in similar position, to the monitor "Atahualpa", that served as floating battery in the port of Callao.
After the battle of Miraflores, it was ordered to sink its ship to prevent that it fell to the enemy's power. He then served as an assistant to President García Calderón and later as an aide to Lizardo Montero, who assumed the presidency of Peru from Arequipa. He conferred the rank of Captain of Frigate on October 8, 1883, when he was appointed deputy for Lima at that year's congress, also established in Arequipa.
At the end of the war, he was appointed fiscal inspector of the Chucuito warehouses, from where he became general consul of the republic in Panama from February 3, 1885, until he was transferred to the port of Bordeaux in France, by government provision in July 8, 1886.
In 1890 he was appointed expert advisor for the valorisation and acquisition of the vapors that would sail by the Lake Titicaca. That year, in June, he traveled to Chile aboard the gunboat "Lima" as a member of the commission presided over by Captain Melitón Carvajal, to bring back the remains of Rear Admiral Grau. On July 24, 1894, he was awarded the rank of Captain. He was later appointed to the post of Consul of Peru in Genoa, Italy. During the first government of Augusto Bernardino Leguía, was appointed Prefect of Lima. The 21 of February of 1911 was promoted to Rear admiral, and two years later, was sent to Europe residing later many years in Valencia, Spain. He died in Lima on May 27, 1927.