It seems like you're referring to a craftsman or contractor who specializes in working with gypsum-based materials for carpentry projects. Gypsum carpenters are skilled professionals who are proficient in installing and working with gypsum boards, also known as drywall, plasterboard, or sheetrock, to create various interior structures, such as walls, ceilings, partitions, and decorative elements.

Installation: Gypsum carpenters are responsible for accurately measuring, cutting, and installing gypsum boards according to project specifications. They ensure proper alignment, fit, and finish to achieve a seamless and professional look.

Finishing: Gypsum carpenters apply joint compound, tape, and other finishing materials to seal and smooth the seams between gypsum boards. They sand and texture the surface to create a uniform appearance before applying paint or wallpaper.