**Selected talks and conference activities:**

Organizer, jointly with E. Friedmann, of the
minisymposium ,,Computational models for pharmacy and related areas", at the ALGORITMY 2020 conference, Podbanske, September 10-15, 2020.
Main organizer of the workshop
,,Mathematics meet pharmacy 2019", at the Faculty of Pharmacy of Charles University, Hradec Kralove, September 23-24, 2019.
Organizer, jointly with E. Friedmann, of the
minisymposium ,,MS1: Mathematical modeling, analysis and simulation of
drug distribution for efficient pharmacotherapy", at the 90th annual meeting of the International Association of Applied Mathematics and
Mechanics (GAMM), Vienna, February 18-22, 2019.
J. Duintjer Tebbens, joint work with G. Meurant: On admissible eigenvalue approximations from Krylov subspace methods for non-normal matrices, invited talk at the Crouzeix's conjecture workshop , American Institute of Mathematics, San Jose, August 1-5, 2017.
J. Duintjer Tebbens, joint work with G. Meurant: The roots of GMRES polynomials need not influence
GMRES residual norms, invited talk at the 2nd NLA Conference on Numerical Linear Algebra and Applications , Luminy, October 24-28, 2016.
J. Duintjer Tebbens, joint work with M. Tuma: Improved incremental 2-norm condition estimation of triangular matrices , presentation at the 2015 SIAM Conference on Applied Linear Algebra , Atlanta, October 28, 2015.
J. Duintjer Tebbens, joint work with M. Tuma: A way to improve incremental 2-norm condition
estimation , talk at the 26th Biennial Conference on Numerical Analysis Glasgow, June 23, 2015.
J. Duintjer Tebbens, joint work with M. Tuma: An accurate 2-norm condition estimator for incomplete
factorization , talk at the Preconditioning 2015 Conference, Eindhoven, June 17, 2015.
J. Duintjer Tebbens, joint work with G. Meurant: On the influence of eigenvalues on Bi-CG residual
norms, talk at the 4th IMA Conference on Numerical Linear Algebra and Optimisation, Birmingham, September 3-5, 2014.
J. Duintjer Tebbens, joint work with G. Meurant: On the convergence curves that can be generated by restarted GMRES, invited lecture at the XIX. Householder
Symposium, Spa, June 8-13, 2014.
J. Duintjer Tebbens, joint work with M.
Tuma: On incremental 2-norm condition estimators, talk at the GAMM Workshop Applied and Numerical Linear Algebra, Wuppertal, September 9, 2013.
J. Duintjer Tebbens, joint work with G. Meurant:Do Ritz values influence the behavior of restarted GMRES? , invited talk at the minisymposium "Developments
in Preconditioners and Iterative Methods for Linear Systems" at the
25th Biennial Conference on Numerical Analysis Glasgow, June 27, 2013.
J. Duintjer Tebbens, joint work with G. Meurant: On using (harmonic) Ritz values to precondition restarted GMRES , talk at the Preconditioning 2013 Conference, Oxford, June 21, 2013.
J. Duintjer Tebbens, joint work with G. Meurant: Can restarted GMRES exhibit any nonincreasing
convergence curve ? , talk at the
GAMM Workshop on Applied and Numerical Linear Algebra Liblice, September 4, 2012.
J. Duintjer Tebbens, joint work with G. Meurant: On prescribing Ritz values and GMRES residual norms generated by Arnoldi processes , invited talk at the minisymposium ,,Computational methods in linear algebra" at the
Algoritmy 2012 conference, Podbanske, September 9-14, 2012.
J. Duintjer Tebbens, joint work with G. Meurant: Prescribing the behavior of the GMRES method and the Arnoldi
method simultaneously , talk at the 2012 SIAM Conference on Applied Linear Algebra , Valencia, June 20, 2012.
J. Duintjer Tebbens, joint work with G. Meurant: On arbitrary convergence behavior of the Arnoldi method , invited poster at the XVIII. Householder
Symposium, Lake Tahoe, June 12-17, 2011. The presentation was awarded the best poster prize, see also this link.
J. Duintjer Tebbens, joint work with M.
Tuma: On some strategies for Jacobian-free preconditioning of sequences of
nonsymmetric linear systems, invited talk at the minisymposium ,,Preconditioning linear systems in large-scale pptimization" of the SIAM OPT 2011 conference, organized by
SIAM, Darmstadt, May 19, 2011.
J. Duintjer Tebbens, joint work with M.
Tuma: Incremental condition estimation with inverse
triangular factors, talk at the Applied Linear Algebra conference, organized by
the Faculty of Sciences of the University of Novi Sad, May 25, 2010.
J. Duintjer Tebbens, joint work with M. Tuma: On an approximate preconditioner update for sequences of large nonsymmetric linear systems, talk at the international IMACS conference
Modelling 2009, Roznov, Czech Republic,
June 22-26, 2009.
J. Duintjer Tebbens, joint work with M. Tuma: On a black-box preconditioner update for solving sequences of nonsymmetric linear systems in matrix-free environment, invited oral contribution at the Winter school: New trends in scientific computing, Luminy, France,
February 9-13, 2009.
J. Duintjer Tebbens, joint work with M. Tuma: On the usage of triangular preconditioner updates in
matrix-free environment, invited talk at the minisymposium on
algebraic preconditioning at the 5th International Workshop on
Parallel Matrix Algorithms and Applications (PMAA'08), Neuchatel, Switzerland,
June 20-22, 2008.
J. Duintjer Tebbens, joint work with M. Tuma: An updated preconditioner for sequences of general
nonsymmetric linear systems, invited talk at the XVII. Householder
Symposium, Zeuthen, June 1-6, 2008.
J. Duintjer Tebbens, joint work with R. Luce,
J. Liesen and R. Nabben: On the solution of the linear systems
arising in the simplex method with modern linear solvers, invited
talk at the minisymposium ,,Iterative methods for large sparse
linear systems and optimization'' at the IMA Conference on Numerical
Linear Algebra and Optimisation, University of Birmingham, UK,
September 13, 2007.
Organizer, jointly with Ph. Birken, of the
minisymposium ,,Preconditioners for sequences of linear systems", at the ICIAM
07 International Congress on Industrial and Applied Mathematics, Zuerich, July 16 - 20, 2007.
J. Duintjer Tebbens, joint work with M. Tuma: Preconditioner updates for sequences of sparse, large and
nonsymmetric linear systems, talk at the GAMM-SIAM Conference on
Applied Linear Algebra, Duesseldorf, July 27, 2006.
P. Schlesinger, joint work with J. Duintjer Tebbens:
Implementations of Fisher's linear discriminant analysis from
the numerical point of view, talk at the 3rd World Conference on
Computational Statistics & Data Analysis, Cyprus, October 29, 2005.

**PhD students:**

Julia Marushki, Andreas Matthios (both at the Faculty of Pharmacy of Charles University).

**Editorial activities:**

Referee reports for
SIMAX,
SISC,
Computational Physics,
Linear Algebra & Applications,
Computational Statistics and Data Analysis,
the
Journal of Computational and Applied Mathematics,
Applied Mathematics and Computation, Kybernetika, LNCS and
IEEE Transactions on Systems, Man and Cybernetics. Managing editor of
Zentralblatt MATH for reviews of
Numerical Linear Algebra and Applications.