Anybody know a landman by the name of John S. Geyer?

Maybe so, but he also represents you for the term of the lease. If the royalty is more than you would've got on your own, plus the protections you want in a lease, plus someone who knows the business representing you all the way, I don't see any problem with that at all. You get what you pay for. Just saying you should research before posting something that is not true. Best of luck to you.