What Do Speech-Language Pathologists Do? Speech-language pathologists, sometimes called speech therapists, assess, diagnose, treat, and help to  prevent disorders related to speech, language, cognitive-communication, voice, swallowing, and fluency in people of all ages. Speech-language pathologists work with people who cannot produce speech sounds or cannot produce them clearly; those with speech rhythm and fluency problems, such as stuttering or slurred speech or other speech impairment; people with voice disorders, such …Read More