Logger, tree trimmer, rock/mountain climber (many SAR members are certified), hunter/outdoorsman, skipper/captain/boat crew, rope access technician (energy companies use them to maintain/ repair power lines), rope manufacturers, someone into bondage (maybe adult store owner or clerk), high-rise window washers, roofers, lifeguards, occupational health and safety administrators, firefighters, outdoor equipment manufacturers, or outdoor store clerk.
I am sure there are many more. These are just the ones that came to mind.