I was reading that King George never visited the colonies and I got curious who was the next highest in his government who visited the colonies before the Revolutionary War.
That's kind of a tricky question because since America was a colony at that point, the governors of each colony were members of the British government, hence they were the highest ranking British government officials there.
No reigning British monarch ever visited the American colonies, in fact the first reigning British monarch to visit America was King George VI in 1939. 1930 was the first year a current British Prime Minster visited. The first member of the British royal family to visit America was Queen Victoria's son Bertie while Prince of Wales (he was later King Edward VII) in 1860.
At the start of the Revolutionary War, the most senior ranking British official in North America was Thomas Gage who was the commander of the British troops but he was primarily stationed in Canada.