He has written over 200 articles for refereed publications in the last 30 years (http: //www.informatik.uni-trier.de/~ley/db/indices/a-tree/e/Ehrig: Hartmut.html).

He has edited many LNCS proceedings volumes over the last 20 years, including: LNCS 3393 (http: //www.springer.com/3-540-24936-2), LNCS 3256 (http: //www.springer.com/3-540-23207-9), LNCS 3147 (http: //www.springer.com/3-540-23135-8), LNCS 2505 (http: //www.springer.com/3-540-44310-X), LNCS 2472 (http: //www.springer.com/3-540-20538-1), LNCS 2128 (http: //www.springer.com/3-540-43067-9), LNCS 1764 (http: //www.springer.com/3-540-67203-6), LNCS 1073 (http: //www.springer.com/3-540-61228-9), LNCS 776 (http: //www.springer.com/3-540-57787-4), LNCS 534 (http: //www.springer.com/3-540-54496-8), LNCS 532 (http: //www.springer.com/3-540-54478-X), LNCS 393 (http: //www.springer.com/3-540-51722-7), LNCS 291 (http: //www.springer.com/3-540-18771-5). These LNCS volumes deal with his particular areas of expertise: Petri nets, graph transformations, category theory, graph grammars, type specification, and software modelling and specification techniques.

He was the subject of the recent LNCS Festschrift: Formal Methods in Software and Systems Modeling, Essays Dedicated to Hartmut Ehrig on the Occasion of His 60th Birthday, LNCS 3393, Kreowski et al., 2005 (http: //www.springer.com/3-540-24936-2).

Prof. Ehrig wrote two previous books for Springer's EATCS series: (i) "Fundamentals of Algebraic Specification 2 -- Module Specifications and Constraints," EATCS Monographs Series, Hartmut Ehrig, Bernd Mahr, 1990, http: //www.springer.com/3-540-51799-5; this sold 1151 copies. (ii) "Fundamentals of Algebraic Specification 1 -- Equations and Initial Semantics," EATCS Monographs Series, Hartmut Ehrig, Bernd Mahr, http: //www.springer.com/3-540-13718-1.

He has been a key promoter of the relevant research area of the book in various EU-funded projects, including COMPUGRAPH (http: //www.sts.tu-harburg.de/projects/Esprit-BR/Synopses/Projects/7183.html).

Finally, Prof. Ehrig was among the coeditors of the World Scientific "Handbook of Graph Grammars and Computing by Graph Transformation."

The fourth author, Dr. Gabriele Taentzer, has written over 50 articles for refereed publications in the last 15 years (http: //www.informatik.uni-trier.de/~ley/db/indices/a-tree/t/Taentzer: Gabriele.html), including the ACM Computing Surveys paper "Graphical Representation and Graph Transformation." Dr. Taentzer is on the Program and Steering Committees of a number of key, relevant conferences (FASE 2006, ICGT 2006), etc.

Further Notes: Prof. Dr. Hartmut Ehrig, TU Berlin, http: //tfs.cs.tu-berlin.de/; Karsten Ehrig, TU Berlin, http: //tfs.cs.tu-berlin.de/~karstene; Ulrike Prange, TU Berlin, http: //tfs.cs.tu-berlin.de/~uprange; Dr. Gabriele Taentzer, TU Berlin, http: //tfs.cs.tu-berlin.de/~gabi.