If you do nothing else, buy his book "Global Expatriates Guide to Investing". It has chapters which specify what you should do with your money depending what country you plan to call home.
Follow his precepts (which essentially cut investment costs to the bone) and you will leave the region at least $250,000 wealthier than if you hire a "professional" to sell you things.
Hallam has nothing to sell but books - he is absolutely unexcelled for straight advice.