ABOUT US. Greater Horizons Professional Services is a behavioral healthcare agency serving clients throughout the greater Houston, Texas area (mainly Sealy, TX, Porter, TX, & Richmond/Rosenberg, TX). We provide mental and behavioral healthcare services to children ages 6-17 as well as to adults with severe psychiatric disorders such bipolar, major depression, and schizophrenia. As a Qualified Mental Health Professional, Community Service (QMHP-CS...