Theo Härder (born August 28, 1945 in Bad Neustadt an der Saale, Germany) is a Professor of Computer Science at the University of Kaiserslautern.
In 1976 he moved to the IBM Research - Almaden in San Jose, California.
In 1977 he returned to TU Darmstadt as a professor at the Department of Computer Science.
[1] Härder has received numerous awards for outstanding scientific achievements in the field of databases.
In 1983, he and Andreas Reuter coined the acronym ACID to describe the essential characteristics of a distributed relational database (Atomicity, Consistency, Isolation, and Durability).