The Cuntz semigroup and the classification of C*-algebras, Centre de Recerca Matemàtica (Barcelona), February to July 2011 (Program Coordinator, jointly with Pere Ara).
Workshop on Dynamics and C*-algebras, Centre de Recerca Matemàtica (Barcelona), April 6-8, 2011 (Member of the Organizing Committee).
Advanced Course on Dynamical Systems, Centre de Recerca Matemàtica (Barcelona), June 14-23, 2011 (Member of the Organizing Committee).
Conference on Structure and Classification of C*-algebras, Centre de Recerca Matemàtica (Barcelona), June 6-10, 2011 (Member of the Organizing Committee).
Discrete and Continuous Methods in Ring Theory, Centre de Recerca Matemàtica (Barcelona), September 2006-July 2007 (coordinated jointly with Prof Dolors Herbera).
Barcelona Conference on C*-algebras and their invariants, Centre de Recerca Matemàtica (Barcelona), June 11-15, 2007 (Coordinator).
2006
Workshop on Graph Algebras, Universidad de Málaga, July 3-8, 2006 (coorganized with Gonzalo Aranda and Mercedes Siles Molina).
2003-2007
Ring Theory Seminar, Departament de Matemàtiques, Universitat Autònoma de Barcelona (Coordinator).
1996
Segundas Jornadas Españolas en Teoría de Anillos, Centre de Recerca Matemàtica (Barcelona), April 1997 (Member of the Organizing Committee).
University of Buffalo, October 18, 2023, to visit Prof. Hanfeng Li. Seminar talk: Traces on ultrapowers of C*-algebras.
University of Kiel, December 5-9, 2022, to visit Prof Hannes Thiel. Seminar talk: Modern aspects of Cuntz semigroups.
Universidad de Málaga, July 22-26, 2019, to visit Prof Mercedes Siles Molina. Seminar talk: Ultraproductos de C*-álgebras, su semigrupo de Cuntz, y sus (cuasi)trazas.
Universitat Autònoma de Barcelona, October 2018. Seminar talk: Existence of infima in Cuntz semigroups and applications to the structure of C*-algebras with stable rank one.
University of Glasgow, April 16-20, 2018, to visit Prof Joachim Zacharias.
NTNU (Trondheim), November 21-25, 2016, to visit Prof Eduard Ortega. Seminar talk: Completeness of the category Cu and ultraproducts of C*-algebras.
University of Glasgow, May 5-9, 2014, to visit Dr Joan Bosa and Prof Joachim Zacharias. Seminar talk: A new look at the category Cu.
Münster Universität, July 2-6, 2012, to visit Prof. Wilhelm Winter. Seminar talk: Strong products, almost unperforation, and almost divisibility.
Center for Operator Algebras (Shanghai), April 23-26, 2012, to visit Prof. Huaxin Lin. Seminar talk: Semigroups in Cu with a strong product.
Purdue University, February 23-March 3, 2011, to visit Prof. Marius Dadarlat and Andrew S. Toms. Colloquium talk: The Cuntz semigroup.
Wabash Extramural Modern Analysis Seminar, Feb 26, 2011. Seminar talk: The Cuntz semigroup of pullbacks of C(X)-algebras.
University of Copenhagen, March 23-27, 2009, to visit Dr Eduard Ortega and Prof Mikael Rørdam. Seminar talk: The corona factorization property and refinement monoids.
The Fields Institute for Mathematical Sciences (Toronto), October 22 to November 30, 2007, participated in the Thematic Program in Operator Algebras. Seminar talk: Purely infinite corona algebras.
University of New Brunswick (Fredericton), June 5-9, 2006, to visit Prof Andrew S. Toms. Mini-course (June 5-6): K-Theory and C*-algebras.
University of Maribor, March 13-24 2006, to visit Prof Matej Brešar. Seminar talk: Recasting the Elliott Conjecture.
Universidad de Málaga, December 12-16, 2005, to visit Prof Mercedes Siles Molina. Seminar talk: Una conjetura débil en la clasificación de C*-álgebras.
Universidad de Almería, October 2004, Meeting of the Non-commutative Algebra Spanish Network. Seminar talk: Anillos, grupos de Riesz y álgebras de operadores.
Universidad de Málaga, September 2004, to visit Prof Mercedes Siles Molina. Seminar talk: Divisibilidad débil en C*-álgebras.
Universidad de Granada, December 2003. Seminar talk: AF-embeddings en C*-álgebras con rango real cero.
Universidad de Málaga, December 9-12, 2003, to deliver the advanced course: Una introducción a la teoría de C*-álgebras.
University of Glasgow, May 2003. Seminar talk: Multiplier algebras have algebraic relatives.
Trinity College Dublin, April 2003. Mathematical Colloquium talk: Gromov’s translation algebras.
University of Copenhagen, April 2003, one month visit to Prof Gert K. Pedersen. Colloquim talk: The exchange property for translation algebras.
University College Cork, December 2002. Mathematical Colloquium: Non-stable K-Theory for two classes of rings.
Mathematical Institute Oxford, December 2002. Seminar talk: Algebraic relatives of operator algebras of low dimension and their non-stable K-Theory.
University of Washington, July 2002, to visit Prof Ken R. Goodearl. Seminar talk: Non-stable K-theory for two classes of rings.
Queen’s University Belfast, March 2002. Seminar talk: Stable finiteness of group rings in arbitrary characteristic.
Queen’s University Belfast, November 2001. Seminar talk: Extensions and pullbacks in QB-rings.
Queen’s University Belfast, March 2001. Seminar talk: A closure operation in rings.
Queen’s University Belfast, Lecturer at the Pure Mathematics Department, 2001-03.
University of Copenhagen, September 1999. Seminar talk: An infinite analogue of rings with stable rank one.
University of Copenhagen and University of Southern Denmark. Seminar talks: Lifting units modulo exchange ideals and C*-algebras with real rank zero.
University of Copenhaguen, May 1999. Seminar talk: Extremal richness of corona algebras of simple C*-algebras with real rank zero.
University of Copenhagen, February-September 1999, Postdoctoral Researcher with Prof. Gert K. Pedersen.
University of California at Santa Barbara, October 1994, and October to December 1995, Graduate student, visiting Prof. Ken R. Goodearl. Seminar talks: Cuntz’s relations on positive elements in C*-algebras (1994); Some comparability relations for C*-algebras (1995).
