Hi, Usha!

Welcome to NeuroTalk!
Your best bet to locate an appropriate attorney is to begin locally. You should find a long list of attorneys in your yellow pages, and most likely a subsection of medical malpractice specialists. Most will give you a free consultation as a sort of job interview to determine if your case is something he/she can handle, and as an opportunity for you to determine if he/she can meet your needs.
You can also contact your county courthouse for lists of attorneys. I hope you can find some relief for your husband.