Job Accommodation Network
The Job Accommodations Network (JAN) has a large amount of information including workplace accommodations or the Americans with Disabilities Act (ADA) and related legislation, technology assistance with accommodations, assistive technology, accessibility or cost of an accommodation.
JAN provides listings of disabilities and accommodations that can be sorted by disability (including brain injury) or by limitation, work-related function, topic or accommodation. There are also resources for individuals, employers and other support professionals.
One of the topics that looks useful is about how to disclose your disability, request and negotiate accommodations in the workplace.