Careers in Assistive Technology
 
The careers that currently hold the most promise for those interested in the
field of Assistive Technology are in the support technology arena. For AT
developments to prove profitable, companies must identify not only
specialized applications for the challenged, but also mainstream applications
in a variety of broad commercial markets. Much of the time, businesses must
produce output for use by the general populace before investors will agree to
fund their projects. Thus people who can "make things happen" are in great
demand. 

http://www.hightechcareers.com/doc500/assistive500.html