If you'd like a solid biography on him, there are over 100 in the English-speaking world today. The most recent is a fine one, elegantly written by Peter McPhee (of the UoM here in Melbourne). Otherwise, Fatal Purity (Ruth Scurr, although I don't think it was published by Cambridge University Press; you'll find it easily, anyway, and it's great, although its contention rests less in sympathy for me than McPhee, for instance). For something less popular (in the sense of popular history), see Jordan's Revolutionary Life of Robespierre. Quite critical of him, and perhaps overemphasises his ideological infallibility, but it's worth reading if you're keen.
I suppose you might as well check out the 2009 BBC documentary on him and the Terror, which is popularly-focused of course, but nonetheless very interesting. The inclusion of certain philosophers/writers as Zizek, Schama and Martel were initially a bit of a concern for me, but they're great additions in retrospect, and add a touch of moral reflection that the others (very notable historians, I may add) featured in the documentary as historians somewhat don't go into so much. The list includes, if my memory serves me correctly, Colin Jones, David Andress, Marisa Linton and Ruth Scurr.
If you're really quite interested, although Merriman is certainly not a revolutionary historian, he's definitely a key French historian and his summary lecture below is quite biographical around Robespierre, and covers him quite generally.
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