Imperial College London


Faculty of Natural SciencesDepartment of Physics

Consul for Faculty of Natural Sciences & Education Office



+44 (0)20 7594 7554s.j.warren




1115Blackett LaboratorySouth Kensington Campus





Research Interests: I am an observational astronomer. I am primarily interested in discovering what is out there, and so I am interested in surveys, particularly for high-redshift quasars, and cool brown dwarfs. I am also interested in (strong) gravitational lensing, and quasar absorption lines.

Brief bio: I have been at Imperial since 1994. My first degree was in Engineering and I worked as a Civil Engineer for 6 yrs, specialising in Geotechnics. I did my PhD at the Institute of Astronomy, Cambridge, supervised by Paul Hewett, finishing in 1988, and then held a number of post-doc positions before moving to Imperial: a NATO Fellowship at Steward Observatory, Tucson, an ESO Fellowship at ESO Headquarters, Munich, and a Royal Society University Research Fellowship at Oxford. I was the Survey Scientist for the UKIRT Infrared Deep Sky Survey which finished in 2012. I was Head of Astrophysics at Imperial from 2010 to 2015.

Astronomers like the Astrophysics Data System, so I have provided a link to my publications on ADS.



Barnett R, Warren SJ, Mortlock DJ, et al., 2019, Euclid preparation. V. Predicted yield of redshift 7<z<9 quasars from the wide survey, Astronomy &amp; Astrophysics, Vol:631, ISSN:0004-6361

O'Riordan CM, Warren SJ, Mortlock DJ, 2019, Galaxy mass profiles from strong lensing I: the circular power-law model, Monthly Notices of the Royal Astronomical Society, ISSN:0035-8711

Ahmed S, Warren SJ, 2019, A homogeneous sample of 34 000 M7-M9.5 dwarfs brighter than J=17.5 with accurate spectral types, Astronomy and Astrophysics, Vol:623, ISSN:0004-6361

Barnett R, Warren SJ, Becker GD, et al., 2017, Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641, Astronomy &amp; Astrophysics, Vol:601, ISSN:1432-0746

Skrzypek N, Warren SJ, Faherty JK, 2016, Photometric brown-dwarf classification. II. A homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 with accurate spectral types, Astronomy &amp; Astrophysics, Vol:589, ISSN:0004-6361

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