Thank you all for the helpful suggestions.
I do have a gentle leader and it helped a little bit, but not enough. I simply wasn't able to get his attention properly. Part of the "problem" from my POV is that Moby is a high-energy little being and I'm not. That's an ongoing issue. LOL.
Fortunately, one of my neighbors is a professional dog trainer. He does training, grooming and pet sitting. He also trains and shows a HUGE German Shepard in police work competitions. He recommended this collar to us and trained us how to use it properly:

http://www.amazon.com/Dogtra-IQ-Yard-Training-Collar/dp/B004HX6QD6
Works like a charm!
Before anybody wines that this is some sort of "shock" collar, it isn't. If you are shocking the dog, you are misusing it. The "shock" is meant as a light electronic tap on the shoulder. That's all it is. And it is effective. I know because I tested it on my arm.
I no longer have to worry about Moby taking off without me, or pulling my arm out of the socket. I'm not confident yet of taking him to parks or trails, but we'll get there soon. I'm sure of it.