Senior Research Scientist at Phase One www.phaseone.com
Image resampling and filtering code contributor to VIPS, ImageMagick, GEGL, NIP2, Upsize GIMP plugin and optiSSIM. Early contributor to QEPCAD (Quantifier Elimination by Cylindrical Algebraic Decomposition), which has a Sage (...ohloh.net/p/sage) interface.
Photomosaic panorama of GIMP developers by Yuval Levy (in the LightTwist installation at Libre Graphics Meeting 2009). I stand at 1 o'clock.