His father, Andrew Alexander, was a civil engineer of some standing and a mechanical engineer. He was interested in aeronautics and was a founder member of the Royal Aeronautical Society in 1866. He presented some papers to the society including "Power in Relation to Weight in Aerial Navigation". In 1875, he went to see Thomas Moy's Aerial Steamer at The Crystal Palace. This machine had many interesting design features and may have achieved a brief hop into the air; accounts vary. That year, Andrew Alexander became manager of the Cyclops works of Charles Cammell and Company in Sheffield, where he worked on the improvement of armour plate for warships.