If you made any changes in Pure these will be visible here soon.

Personal profile

Personal Statement

My primary research interests are numerical linear algebra and its application to problems in scientific computing. Most of my work has focused on understanding the convergence behaviour of Krylov subspace methods for solving linear systems, and on developing preconditioners for specific applications. I have also been involved in projects that apply ideas from tropical algebra to problems in numerical linear algebra, such as pre-scaling matrices before solving linear systems. Current projects include developing fast solvers for problems from fractional diffusion, and analysing problems in broadband signal processing. 

I have been a lecturer in the Department of Mathematics and Statistics since 2015. Prior to this I held postdoctoral positions at The University of Manchester and the University of Oxford. I obtained my DPhil from the University of Oxford in 2012.

I am a member of SIAM, and am an editor of the SIAM Fundamentals of Algorithms book series. I am also a member of the Edinburgh Mathematical Society, the London Mathematical Society and am a Fellow of the Institute for Mathematics and its Applications. 

My personal webpage can be found here.

External positions

Editor of SIAM Fundamentals of Algorithms Book Series

Jan 2018Dec 2019

Secretary of SIAM Activity Group on Linear Algebra

Jan 2016Dec 2018

Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

  • 4 Similar Profiles
Preconditioner Mathematics
Preconditioning Mathematics
GMRES Mathematics
MINRES Mathematics
Linear systems Engineering & Materials Science
Saddle Point Systems Mathematics
Toeplitz matrix Mathematics
Eigenvalue Mathematics

Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Projects 2017 2022

Research Output 2013 2019

Iterative approximation of analytic eigenvalues of a parahermitian matrix EVD

Weiss, S., Proudler, I. K., Coutts, F. K. & Pestana, J., 1 Feb 2019, (Accepted/In press). 5 p.

Research output: Contribution to conferencePaper

Discrete Fourier transforms
Maximum likelihood

Sample space-time covariance matrix estimation

Delaosa, C., Pestana, J., Goddard, N. J., Somasundaram, S. & Weiss, S., 1 Feb 2019, (Accepted/In press). 5 p.

Research output: Contribution to conferencePaper

Spectral density
Covariance matrix
Error analysis


Best Student Paper Award

Connor Delaosa (Recipient), Fraser Kenneth Coutts (Recipient), Jennifer Pestana (Recipient) & Stephan Weiss (Recipient), 2018

Prize: Prize (including medals and awards)