B H Andrews, Conference on Partial Differential Equations, Mathematisches Institut Oberwolfach, June 13--19 (invited speaker).
R J Baxter, Workshop on "Random matrices and their application", Mathematical Sciences Research Institute, Berkeley, California, January 19--22 (invited speaker); Workshop on "Random matrices, statistical mechanics and integrable systems", Mathematical Sciences Research Institute, Berkeley, California, February 23 (invited speaker).
D J Daley, INFORMS Conference, Ulm, July 24--31 (invited speaker).
L Grosz, 1999 International Conference on Preconditioning Techniques for Large Sparse Matrix Problems in Industrial Applications, University of Minnesota, June 10--12.
P G Hall, State of the Art in Probability and Statistics, Leiden University, March 21--30; International Conference on Probability and Statistics and their Applications, Hanoi University, June 6--12; Joint Statistical Meetings, University of Baltimore, August 8--12 and International Statistical Institute 52nd Biennial Meeting, University of Helsinki, August 13--20; 1999 Mathematics Conference of Mathematical Society of R.O.C., Taiwan, December 6--12 (invited speaker).
A W Hassell, Generalized Dirac operators and their Geometric Scattering Theory, Banach Centre, Warsaw, August 23 -- September 2 (invited speaker).
C C Heyde, Conference on Finance and Statistics, Oberwolfach, March 7--13 (opening lecture); CAP APD99, Columbia University, April 23; DIMACS Workshop on New Market Models, Rutgers University, New Jersey, April 26--27 (joint organiser); 6th CAP Workshop on Mathematical and Computational Finance, Columbia University, New York, November 2--3.
A V Isaev, 4th Korean Several Complex Variables Symposium, Seoul, December 12--16 (invited speaker).
A G R McIntosh, Second International ISAAC Conference, Fukuoka Institute of Technology, September 15--21 (invited speaker).
M F Newman, Computational Group Theory, Ohio State University, June 15--19; Computational Geometry and Group Theory, University of Warwick, July 9--17 (invited speaker).
M R Osborne, SIAM Optimization and SIAM Annual General Meeting, Atlanta, May 10--14.
L Peng, Statistical modelling - extreme values and additive laws, Cidade Universit'aria, Lisbon, October 2--6.
T Tran, Fast solution methods for integral equations, 36th Annual Technical Meeting of the Society of Engineering Science, University of Texas at Austin, October 25--27.
N S Trudinger, Partial Differential Equations, Oberwolfach, Germany, June (invited speaker); New Zealand Mathematics Colloquium, Christchurch, July (Plenary Speaker); Equadiff99, Berlin, August (symposium organiser and invited speaker); International Conference on Nonlinear Analysis, Taipei, October (invited speaker).
A H Welsh, Japan Statistical Society Conference, Okayama, July 28--30 (invited speaker).
S R Wilson, School of Modern Statistical Methods in Medical Research, The Abdus Salam International Centre for Theoretical Physics, Trieste, September 20--24 (invited speaker).