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Hyperactivity. Inattentiveness. Poor time management skills. These are a few of the challenges a typical adult with attention deficit hyperactivity disorder (ADHD) faces in the workplace on a daily basis. With nine million adults in the United States affected by the disorder, odds are that you will likely have to deal with an employee who has ADHD. However, unlike most disabilities, ADHD is particularly difficult to understand because it's not always obvious and often goes undiagnosed, says Wilma Fellman, a professional career counselor who specializes in working with people with disabilities.