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Most of my research is performed as a member of one of the following collaborative teams.


The automatic Measurement of Galaxy Morphology (MegaMorph) was the goal of a project that led, together with Alex Rojas at Carnegie Mellon University in Qatar and a groups of international collaborators. We developed and implemented a number of novel ideas for improving the the technique of decomposing galaxy images into their constituent components. We received funding from the Qatar National Research Foundation for two dedicated postdocs to tackle this problem, one at Nottingham University and another at CMU-Q. More details…

Galaxy Zoo

I am a core member of the Galaxy Zoo team. I work primarily on: defining the sample and imaging data set, reducing the clicks of participants to robust, well-understood measurements of use for scientific analysis, and the statistical analysis of the resulting morphological information to learn about various aspects of the galaxy population.

Citizen Science Alliance

I am an advisory board member, and founding Science Director, of the Citizen Science Alliance, an organisation dedicated to developing, managing and utilising internet-based citizen science projects (such as Galaxy Zoo) in order to further science itself, and the public understanding of science. The public face of the Alliance is the Zooniverse, which provides an entry point to all our projects and a focus for our community of citizen scientists.

Galaxy And Mass Assembly

I was a co-Principal Investigator of the Galaxy And Mass Assembly (GAMA) project. This project assembled a highly homogeneous, multi-wavelength data set with which to address many key questions in galaxy evolution and cosmological structure formation.

OSIRIS Mapping of Emission-line Galaxies in A901/2

A study of the distributions of star-formation and AGN within the supercluster A901/2, using tuneable-filter observations from OSIRIS on the GTC. These provide two-dimensional spatially-resolved spectroscopy of the Halpha and NII emission lines. The work for this project was performed by PhD student Bruno Rodriguez and PDRA Ana Chies Santos, with supervision from Alfonso Aragon-Salamanca, Meghan Grey and myself.

Planetary Nebula Spectrograph

The Planetary Nebula Spectrograph (PN.S) is a specialised instrument for efficiently measuring the positions and velocities of planetary nebulae in external galaxies. This provides important information on the kinematics of these galaxies, which is difficult to obtain otherwise, for example at large radii for objects with very little HI gas.

ESO Distant Cluster Survey

I have been involved with the ESO Distant Cluster Survey (EDisCS) since my PhD. My main interest is in measuring the rotational velocities of these galaxies to compare the Tully-Fisher relation of cluster and field spirals. This work is being led by a PhD student at Nottingham, using code I developed previously.