He has experience with a range of top science boards and advisory panels including those of the Natural Environment Research Council, HEFCE, the Natural History Museum, the Max Planck Society, the Royal Society and the American Geophysical Union.

[citation needed] Alex Halliday is an isotope geochemist known for novel mass spectrometry techniques and their applications to the Earth and planetary sciences.

An enthusiast for technological innovation, most of Halliday's recent research is in developing and using new mass spectrometry techniques to shed light on the origin and early development of the solar system[8] and recent Earth processes, such as continental erosion and climate.

However, he has also been engaged in other studies, such as the mechanisms of volcanic eruptions, and the formation of mineral and hydrocarbon deposits.

[15] He was elected a Fellow of the Royal Society in 2000 and a Foreign Associate of the U.S. National Academy of Sciences in 2015.