[2][3] These are astrophysical experiments that are lifted into the stratosphere by high-altitude balloons where they conduct observations that would be hindered by atmospheric interference if done on the ground.
[1] Most notably, he was a key member of the instrument team for BOOMERANG, the experiment that made one of the first accurate determinations of the age, geometry, and mass-energy content of the universe.
[9][10] He then became a Millikan Postdoctoral Research Fellow at the California Institute of Technology until 1999, when he was granted a faculty position at the University of Toronto.
[1] Along with his students, and in collaboration with research groups from other institutions worldwide, he is currently working on the design, assembly, and testing of three balloon-borne telescopes.
The first, BLAST-Pol, is the BLAST telescope with added sensitivity to polarization, which enables it to observe magnetic fields in star formation regions.