Respondent demonstrated gross negligence in the practice of a Board regulated profession in violation of A.R.S. § 32-128(C)(2). Respondent accepted professional engagement or assignment outside the Registrant's professional registration category in violation of A.R.S. § 32-128(C)(4) as it relates to A.A.C. R4-30-301(17). Respondent provided professional services through an unregistered firm in violation of A.R.S. § 32-121 and 32-141(A). Respondent practiced and/or held himself out as qualified to practice Architecture without Board registration in violation of A.R.S. § 32-145(1).