Respondent practiced a board regulated profession without registration in violation of A.R.S. § 32-121. Respondent practiced, offered to practice or held himself out as qualified to practice Engineering, without registration in violation of A.R.S. § 32-145(1). Respondent's firm engaged in the practice of Engineering without registration with the Board and the services offered were not under the responsible charge of a registered principal in violation of A.R.S. § 32-141. Respondent displayed a device that indicated to the public that Respondent was registered to practice a Board regulated profession, without registration in violation of A.R.S. § 32-145(2). Respondent caused the mega! use of a registrant's seal, signature or stamp on documents prepared by the Respondent, a non-registrant in violation of A.R.S. § 32-125(D).