His company , Ridder Publications , Inc. , later merged with Knight Newspapers , Inc. in 1974 .
His company , Ridder Publications , Inc. , later operated under the name Knight Ridder until 2006 , when the company was purchased by The McClatchy Company .
His company , Ridder Publications , Inc. , later merged with Knight Newspapers , Inc. in 1974 , and operated under the name Knight Ridder until 2006 , when the company was purchased by The McClatchy Company .