Dr. Margaret Evelyn Hollister, of Shreveport, LA, daughter of Lawrence Palmer and Barbara Dunevant Hollister, of Moseley, and Steven Ray Sigman, of Bossier City, LA, son of Donald Ray and Jolene Sigman, of Cambridge, OH, announce their engagement.

Dr. Hollister is a 1999 graduate of Longwood University and 2003 graduate of Virginia Commonwealth University Medical School. She is currently employed by Louisiana State University Health in Shreveport as a Fellow of Allergy and Immunology. She is the granddaughter of the late Richard and Katie Dunevant, of Buckingham, and Horace and Louise Hollister, of Midlothian.

Mr. Sigman is a plant manager for Raytech Industries. He is the grandson of the late Carl and Evelyn Sigman, of Cambridge, OH, and John Clark and Evelyn Crossen, of Cambridge, OH.

A July 14 wedding is planned.