MD/PhDs in biotech consulting

Read in some thread that some MD/PhDs working in the right area are able to do some consulting to supplement their income. Do these careers just come about through random ties to industry/academic centers tied to venture capital firms? How does consulting affect a physician scientist's rsrch/clinic balance - is it feasible to do all three?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Physician Scientists Source Type: forums