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Joseph Yoder   -   President

Joseph Yoder is a founder and principle of The Refactory, Inc., a company focused on software architecture, design, implementation, consulting and mentoring on all facets of software development. Joseph is an international speaker and pattern author and longstanding member of The Hillside Group, a group dedicated to improving the quality of software development. He is co-author of the Big Ball of Mud pattern, which illuminates many fallacies in the approach to software architecture. Joseph has chaired the Pattern Languages of Programming Conference (PLoP), as well as presented tutorials and talks at conferences such as OOPSLA and ECOOP. 

Lise B. Hvatum   -   Vice President/Director




Rebecca Wirfs-Brock   -   Treasurer

Rebecca Wirfs-Brock is an internationally recognized leader in the development of object design methodologies. She invented the set of development practices known as Responsibility-Driven Design. Among her widely used innovations are use case conversations and object role stereotypes. She is the regular design columnist for IEEE Software and the author of the classic text, Designing Object-Oriented Software. Her most recent book, Object Design: Roles, Responsibilities and Collaborations, was published in 2002.  

Christian Kohls   -   Member/Director



Mary Lynn Manns   -   Member



Kyle Brown   -   Member



Michael Weiss   -   Member



TakashiIbaTakashi Iba  -   Member

Takashi Iba is an associate professor at the Faculty of Policy Management and the Graduate School of Media and Governance at Keio University, Japan. He received a Ph.D. in Media and Governance from Keio University in 2003. With collaborating with his students, Dr. Iba created many pattern languages concerning human actions. He authored Learning Patterns (2014), Presentation Patterns (2014), Collaboration Patterns (2014), Survival Language (2015), Words for a Journey (2015) and many academic books in Japanese such as the bestselling Introduction to Complex Systems (1998)."

Eduardo Guerra   -   Director



Richard P. Gabriel   -   Emeritus Member




Bob Hanmer   -   Emeritus Member

Alcatel-Lucent: Robert S. Hanmer is a Consulting Member of Technical Staff at Alcatel-Lucent. His work has included development, architecture and evaluation of highly reliable systems for the telephone network, especially in the areas of reliability and performance. He has also been active in the software patterns community since the mid-1990's, writing patterns and organizing pattern conferences. He has authored or co-authored 14 journal articles and book chapters. He has been introducing newcomers to patterns and to writing patterns since 1995.

Neil Harrison   -   Emeritus Member



Ademar Aguiar   - Emeritus Member




Dirk Riehle   -   Emeritus Member

Prof. Dr. Dirk Riehle is the Pro­fes­sor for Open Source Soft­ware at the Friedrich-Alexander-University of Erlangen-Nürnberg. Before join­ing acad­e­mia, Riehle led the Open Source Research Group at SAP Labs, LLC, in Palo Alto, Cal­i­for­nia (Sil­i­con Val­ley). Riehle founded the Wiki Sym­po­sium,, a con­fer­ence ded­i­cated to wiki research and prac­tice. He was also the lead archi­tect of the first UML vir­tual machine. He is inter­ested in open source soft­ware engi­neer­ing and agile meth­ods, com­plex­ity sci­ence and human col­lab­o­ra­tion, and soft­ware design. Prof. Riehle holds a Ph.D. in com­puter sci­ence from ETH Zürich and an M.B.A. from Stan­ford Busi­ness School. He wel­comes email at This email address is being protected from spambots. You need JavaScript enabled to view it., blogs at, and tweets at @dirkriehle.

Grady Booch   -   Emeritus Member




Linda Rising   -   Emeritus Member

Independent Consultant: Linda Rising is an independent consultant in the areas of agile techniques, retrospectives, patterns, and organizational change. She is very active in the pattern and agile communities. She has authored or co-authored four books and countless journal articles and book chapters. She has been teaching patterns and pattern writing since the mid-1990's.


Dr. James Noble   -   Editor in Chief

James Noble is Professor of Computer Science and Software Engineering at Victoria University New Zealand. He is the author of Small Memory Systems: Patterns for Systems with Limited Memory (with Charles Weir), the editor of Prototype-Based Programming and Pattern Languages of Program Design 5 (with various co-editors). He has published many papers on object-orientation design patterns, aspects, software visualisation and software engineering in international academic conferences and journals.

Dr. Ralph Johnson   -   Editor in Chief




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