Name the Biologist

More technique based ones. This one is a little tricky but I'm going for the one who developed the most recognisable technique and the one who named it/helped make it popular. Plenty of clues before the picture this time!

Disclaimer: I can't 100% verify the person in the 2nd picture is the one I mean - but others online seem to have made the claim...

As for last week that was
Stanley Fields for developing the Yeast-2-Hybrid screen. These days it seems mass spec techniques have surpassed the technique but I'm sure there are still uses for it in specific cases. I know it was a technique that was constantly drilled into students 10 years ago though!