Career choices?

Does he have a college degree? That would be a good first step. He could get a double major in math and geo, and then he will learn the possibilities as he goes along with that. Eventually he could get a graduate degree writing a thesis combining both areas.

I can think of a lot of possibilities, but one that comes to mind is land use management, surveying land, urban planning, anything to do with planning and plotting usage of land. Another possibility is combining statistics with geography...that could lead to analysis of population trends by geographic region, etc. Another possibility could be in a business for customer analytics. Agencies like NASA, and Homeland security, as well as the FBI and CIA need people with these specialities to analize demographics. He could be a guru in a specific topic if he found the right combination, and loved it.

Or, he could just get free beer and be happy.

Many people who have strong math skills end up either in computers, actuary or finance. There is a lot of work in GIS that combines both geography and math. It is a pretty speciallized field and it definitely requires a college degree, not necessarily that specific a job.

He should study what interests him in college, and he should be able to find some somewhat related employment. This country does not produce enough Computer Science graduates to fill all the computer positions, so related majors such as Math are very much in demand in the computer/IT field.

National Park Service

Civil Engineer (design road systems, etc.)

Mining Industry

National Weather Service

FBI (they are always looking for smart people)

He could work for a company that provides solutions in terms of location finding. Such as a map company or a EPS company...

engineering