Arriving in  Belgrade in 1872, young George Weifert took an active part in the public life of the newly established Kingdom of Serbia.  In the year before the Serbian - Turkish war of 1876-78 broke out,  he donated funds to  purchase  the first canons for the artillery battery of the Serbian army. During that war he volunteered and was enlisted into the cavalry. He distinguished himself  by carrying messages between units on the front lines, under  enemy fire. For his courage, he was awarded  a ‘medal for bravery’. Upon his death in 1937, in accordance with his will,  of all the awards and jewels that this great man  received  in his lifetime, this medal was the only jewel  placed in  the coffin.

Not being a member of any political party in Serbia, he always served as a person of compromise and balance in the turbulent political life of the new state. Following the armed revolt against the King Milan Obrenovic in 1883, in The Timok region of Serbia, called ‘The Timok Rebellion' (or Timocka buna), a number of politicians were arrested for treason , and  faced the death penalty. George Weifert, in a potentially dangerous audience with the  King, pleaded for their lives, and convinced the temperamental king to commute their death penalty to a prison sentence, thus preventing  further bloodshed in the 'flammable' region of Timok.

 In  1893, he was one of the founders of  ‘The King Stephan Dechanski’ (or Kralj Stevan Decanski ) Society for the education of deaf children,  whose purpose was to provide home and schooling. Throughout his life he was one the major benefactors of  this society and also its honorary president.

In  1903, when in the military coup against the Obrenovich  Dynasty,  King Aleksandar Obrenovich  and his wife Draga Masin were brutally  murdered, and a new Karageorgevich  Dynasty (or Karadjordjevic) came to power, George Weifert gave  financial support to the families of the army officers killed during the coup. Years later, this action of his,  caused some historians to classify him as a civilian supporter of the coup itself.  Brother Weifert’s answer to those accusations was: ‘No, I just helped those poor families of  soldiers who died for what they believed in’^[13].

During the First Balkan War of 1912, he paid for 60.000 loaves of  bread, which were distributed  from the Masonic Temple  to the poor families in Belgrade during this time of privation.   In this war Serbian army captured a big number  of Turkish officers and soldiers. Some of war prisoners  were Freemasons.  George Weifert pleaded with Serbian authorities on their behalf, and as a result, Turkish  Freemasons were released and sent home.  Immediately after the war he established the’  St. George Fund’ to provide financial assistance to war veterans.

At the beginning of the First World War in 1915, Serbia was occupied by Germans.  During the years of  war George Weifert  lived in the  South of  France , where he organized humanitarian help for the people of occupied Serbia. After the war he returned  to Belgrade  to help in  rebuilding  the country that had been destroyed by the fleeing  German  forces.

In 1929, George Weifert, together with the ‘Edinburgh Council of Scottish Women’, and ‘The London  Council of Scottish Women’, funded the building of the ‘Hospital for Women and Children’ in Belgrade^[14]. He also donated a piece of land for the construction of the headquarters  of the ‘Belgrade Women’s  Society’^[15] (or Beogradsko Zensko Drustvo). Among many other philanthropic endeavors, one might mention  large financial donations towards the construction of the Serbian Academy of Science and Arts.

He was also a passionate antique and coin collector. In 1931, he donated his collection of antiques to the Museum of the City of Belgrade, and his valuable coin collection, consisting of 14,000 ancient Greek and Roman coins, to the Belgrade University. But the most impressive of his legacies was the building of two churches: 'St. Anna', a Roman Catholic church in his birth place of Pancevo, and ‘St. George’, an Orthodox Christian church in Bor. On his death  in 1937, the Catholic Bishop of  Pancevo denied him the  right to be buried in the churchyard of the church  he has built, because he was known to be a Freemason.