Charles H. Kriebel of Sewickley, a retired Carnegie Mellon University professor and widely published expert in information technology management, died of complications following a heart attack Tuesday at West Penn Hospital. He was 75.

Dr. Kriebel, formerly of Fox Chapel, also worked over the years as a consultant and had a client list that included McKinsey & Co., the RAND Corp., Citigroup and Westinghouse, among others, his family said.

He received a bachelor's degree in economics from the University of Pennsylvania in 1959 and a master's degree in statistics there in 1961. He received a doctorate in optimum design of production and information systems from Massachusetts Institute of Technology in 1969.

He taught business briefly at MIT before moving to Carnegie Mellon in the early 1970s, during the administration of then-President Richard Cyert. Dr. Kriebel's career there spanned nearly 30 years until his retirement in 1999.

He wrote dozens of books and articles on topics that included mathematical models of information systems, said his son, Paul Kriebel of Sewickley.

"He was naturally gifted in math," Mr. Kriebel said of his father. "I was having problems with finance homework at the [University of Pittsburgh] Katz Graduate School of Business. I asked him, being a professor, if he could help me.

"I said, 'There's a formula for it. Are you familiar with it?' He said, 'No, but I bet I can get an answer.'

"I went to bed. When I came down in the morning, there were three or four pages of mathematical equations. He got the answer to the fifth decimal."

Dr. Kriebel and his late wife, Jan McAuley, were married for 43 years.

Besides his son Paul, survivors include another son, Carl Kriebel, also of Sewickley; a daughter, Susan Kriebel of Greensburg; a brother, William V. Kriebel of Philadelphia; and six grandchildren.

A Mass will be celebrated today at 10 a.m. at St. Scholastica Church in Aspinwall. Burial will be in Homewood Cemetery in Point Breeze.