摘要
DOI： 10.1007/s11424-010-0002-9 2 June 2010 QThe Editorial Office of JSSC ＆ Springer-Verlag Berlin Heidelberg 2010 Professor David L. Russell just celebrated his 70th birthday in 2009. His numerous important and fundamental contributions to the control theory of partial differential equations have won him recognitions as a true pioneer and giant in this field. And his pleasant personality and ready helpfulness have won our hearts as his admirers, students, and friends.
