1. Supervisor, Struct. Analytical Div., Sargent and Lundy Engrs., Chicago, Ill.
2. Assoc. Prof., Dept. of Mech., Mechanical and Aerospace Engrg., Illinois Inst. of Tech., Chicago, Ill. and Consultant to Sargent and Lundy Engrs., Chicago, Ill.
3. Sr. Engr. Analyst, Struct. Analytical Div., Sargent and Lundy Engrs., Chicago, Ill.