A person licensed to practice engineering or architecture in a state, subject to all laws and limitations imposed by the state’s Board of Engineering and Architecture Examiners. A registered engineer or architect is engaged in the professional practice of rendering service or creative work that requires education, training, and experience in engineering sciences and special knowledge of mathematical, physical, and engineering sciences for the purpose of securing compliance with specifications and design in such professional or creative work as consultation, investigation, evaluation, planning or design, and supervision of construction