New S.E.C. Commissioner takes oath. Washington, D.C., May 18. Leon Henderson, whose nomination as a member of the Securities and Exchange Commission was recently approved by the Senate, was sworn in and assumed the post today. Left to right: Commissioner Edward C. Eicher, Commissioner Jerome Frank, Francis P. Brassor, Secretary of the Commission who administered the oath, Commissioner George C. Mathews, Leon Henderson, and Commissioner Robert E. Healy