Terry Taylor is an agent with the U.S. Foreign Service.
Probably. That is how he identifies himself in the first of two recorded adventures. As such an operative he is involved in a mission to courier some important documents to the embassy in Shanghai. While he is trusting enough to fall into a trap immediately upon arrival, he is determined enough and lucky enough to snatch onto a clue and follow it until it results in a successful conclusion. That does mean forcing a taxi driver to crash and then waylaying a passing motorist and finally taking part in an aerial combat. One interesting question came to mind when he talked with three different citizens of Shanghai - did they all just happen to speak English or did he speak Chinese like a native?
On the other hand regarding his employment, in the second story he is reporting to the Department of Justice headquarters and is on the trail of a couple of kidnappers, neither of which are involved in anything foreign so maybe he switched departments (State to Justice).
We the reader learn almost nothing about Taylor in the two very short tales we have of his exploits.
He is likely in his mid to late 30s based on his appearance. He has dark closely cut hair with a receeding hairline that adds to his mature image. He always dresses in a suit and tie even when on a chase or shooting down a fleeing bad guy's plane. He is resilient but human shown by the fact that when he is knocked unconscious on one mission, he stays that way for a couple of hours but when he does come to, he is raring to go.
We also know that he has a sense of humor, or possibly irony, shown when he risks his life to leap off a cliff into water to save a man he wants to arrest and see later seated in an electric chair. Odder still because he is the one who moments earlier threw the man off the cliff in the first place.