This may be a little too broad but I think successful people will be successful people despite the era. The great dog men of yester year figured some things out, put in some time and had great successes. Todays successful dog man is no different.

Sort of like the Top 5 dog men from the sixties all had 60's science and information available to them. They used it and maybe some of them were in the 70's while the gist of the group was still plugging along in with 60's information. The guys doing really well in the 90's all had 90's science and information at their disposal and they used.

Most of the time the successful people just simply use what is available to them better than the guy down the road. Like if Jack's book was written in the 60's a certain number of people would use it and a certain number of people would stick to their version of doing things, maybe 50's or even the 40's. And when people do not use what is available and out there usually they get left behind.

I don't think there is much difference between the eras. EWO