Mark Hennelly has worked the GDRSD for the past twenty years. After serving as a GDRMS guidance counselor/special education teacher for eleven years, he has spent the last nine as a GDRHS guidance counselor.
Mark is also the international student adviser and has coached the varsity girls basketball team for the past thirteen seasons. He earned a B.A. in Psychology from SUNY Geneseo in 1994 and a Master of Social Work from Salem State University in 1996.