Probably a burning bush. Cut down to low stumps at end of winter. Do not prune again until some years of re-growth has resulted in size being more than you want, then repeat procedure. This way an attractive natural shape (above the stumps) can be maintained between renovations.

Thank you! I found the purple/pink one available at logees. I might just order this for my parents.

Inkberry holly is a good native evergreen which has done well for me. It may take it some time to reach the height you mentioned. Another good native I love, and it makes a great hedge is Cranberry Viburnum. It flowers in the Spring, gets red berries in the fall, and it is a fast, upright grower. The foliage is EXTREMELY dense. Although deciduous, it leafs out early and the leaves hold late, with great fall color!

Very likely that's variety of syzygium, bit hard to tell though from the photo, perhaps you could post a close up of the foliage. If it is a syzygium it may suffer from psyllid attack, check the leaves for little lumps. If they are there that should confirm id.