Felipe says on 8/Feb/10
Judging by this photo, he looks 6'1 (185 cm).

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wowuguys says on 17/Jul/09
there is some scene where he looks taller than michael and some scene michael looks taller i think their both 5'11

Patrick says on 8/Apr/09
I still see him between 6' and 6'1.

vtec says on 10/Mar/09
stood next to zach quinto in heroes, looked exactly the same height. solid 6.25

Patrick says on 19/Feb/09
In another CI episode in 2007, he looks even taller than in 2006 despite his age! If this marvelous actor is less than 6', I'll eat my hat!

Patrick says on 16/Jan/09
In 2006 Criminal Intent episode he doesn't look short at all next to Vincent D'Onofrio, less shorter than beside Tom Welling in Smallville anyway!
Maybe not 6'1 anymore(although...) but no less than 6 neither.

timmy tims says on 27/Dec/08
Watch 'Scrooged', John stands next to Bill Murray many times and looks 2-3 inches shorter. So he cant be 6ft.

Anonymous says on 25/Aug/08
6'1 in his prime, Rob?

Drove says on 11/Jul/08
Appear smaller to me... i said TO ME!!

Zeros says on 23/Jun/08
Yeah,he is 6'0,he looks 1 cm taller than Rosenbaum in Smallville.