Diana Haines Interior Design aka Sierra Yosemite Designs, was established in 1985 and offers two design locations within California—her main office located in Ahwahnee, California services the central valley and mountain regions and a secondary office servicing the bay area located in Aptos, California. Diana Leksell has her degree in Interior Design and received her CCIDC Design Certification in 1993. She is a professional member and past-secretary of IDG, professional member of NKBA, and Allied member of ASID.