Your main research interests lie in QSO absorption-line systems.
The wretched anglo-saxons seem fixated on seeing things: unless they have an images they can flog to the media, they are just not happy. You, however, are more enlightened about these things (it comes naturally, being French).
The trouble with trying to see galaxies in the early universe is that all you can see will generally be stars. What's wrong with that, the English-speaking fools may ask? Well, most of the universe is made up of dark matter and gas: stars are only a trace impurity, even today. And in the early universe, before most of the stars have formed, stars must be an even less significant component of the universe.
It clearly makes far more sense to study the gas in the early universe. Gas is simple: we understand how it behaves. There is far more mass in gas than stars. By looking at the dynamics, distribution and metallicities of the gas, we can learn about dark matter, nucleosynthesis and galaxy formation in ways that picture fixated astronomers will never do.
So, how do you study gas in the early universe? QSO absorption-lines, of course. You have spent a decade obtaining high resolution spectra of distant QSOs, studying the gas that lies along the sight-lines. This technique has taught the world far more about the early universe than all others combined. Highlights include:
absorption-line systems (clouds of neutral hydrogen with column
densities of 
, Mike Fall and collaborators
were able to calculate the star formation rate of the universe as a
function of time: five years before anyone else came close. forest lines are by far the
most common denizens of the high redshift universe, and probably contain
more baryons than all galaxies and bigger objects combined.