Alby Murdoch is an agent with the Australian D.E.D.
That acronym stands for the "Directorate of Extraterritorial Defense" and is part of that country's Intelligence Community. Apparently it got its start during World War Two as a group of coast watchers but then the man in charge got to thinking about ways to keep a good paying job after the war was over and began to find ways to get involved in other defense matters. Before long it was its own small bureau and since its operatives actually got things done more often than not, it got to hand around.
Murdoch got involved with D.E.D. many years before his first recorded adventure. It began when his interest in photography got some of his photos noticed by people in the cloak and dagger business. He was offered a job. It was his idea to use his camera-snapping skills as a cover and it worked out quite well.
He then came up with an even better idea in the creation of World Pix, a legitimate photo selling enterprise. Offering darn good images at a reasonable, albeit not cheap, price to magazines and newspapers and advertising people was genius because not only did it provide considerable funds for the running of D.E.D. (which make the bean counters in government very happy), it gave fantastic camouflage to activities of the agents wherever they went around the world. These people were thus not just espionage agents using a photographer cover, they were actual photographers who got a bit of spying done while on assignment.
Murdoch is no spring chicken but he is not ready for the pasture quite yet. Though his age is not mentioned, I would put it in the mid to late 30s. He's seen a lot, done a lot, had quite a bit done to him, and isn't likely to be too surprised by much. He is extremely capable and highly trustworthy, as long as you don't get ridiculous about it. By that I mean, if you entrusted your child with him, he would protect and defend the tyke to his last breath. If you asked him to safeguard your drop-dead gorgeous sister or a bottle of single-malt Scotch, though, you might have a problem if both were say over the age of 21.
Having been around a lot and done a lot of good for his country, Murdoch has made a good number of decent friends upon whom he can, and does, call when the chips get down or gun barrel raised. He has also made his share of people who would not mind attending his funeral either, though thankfully most are not too enthused to be the cause of it.