John H. Ellwood retired from J.H. Ellwood & Associates Inc., the Chicago consulting firm he founded in 1977. Russell W. Hill, formerly president, now is chairman and chief executive, replacing Mr. Ellwood. The three members of the management team were named to new positions while keeping their old responsibilities. Susan B. Toth, director of support services, was named president and chief operating officer. Daniel R. George was named chief investment officer, but will remain director of consulting. Bradley J. Levandoski, director of research, added the new position of chief information officer.