Edward and Lena Johnson of Frederick, Md., announce the engagement of their daughter, Patricia, to Thomas Glass, also of Frederick. Mr. Glass is the son of Russ Glass of Myersville, Md., and Vicki and Jerry Melton of Vicksburg.

Miss Johnson is the granddaughter of the late Mr. and Mrs. Frank Nichols of Osceola Mills, Pa., and the late Mr. and Mrs. Buckner Johnson of Baltimore, Md.

Mr. Glass is the grandson of the late Mr. and Mrs. O.B. Hickman Sr. of Vicksburg and the late Mr. and Mrs. Charles Glass of Waynesboro, Pa.

The bride-elect is a 1996 graduate of Frederick High School, where she was a member of the National Honor Society.

She received a Bachelor of Arts degree in psychology in 2000 from Belmont Abbey College, where she was on the dean’s list. She received a Master of Science degree in psychology in 2003 from Loyola University.

Miss Johnson is a grants manager for HRSA.

The prospective groom is a 2002 graduate of Frederick High School. He received a Bachelor of Science degree in accounting and finance in 2007 from Indiana University.

Mr. Glass is a project controls analyst at URS Corp.

Vows will be exchanged May 5, 2012, at Houmas House in Darrow, La. A reception will follow. Attendance is by invitation only.