[lemma=investigator] [!tag=","] [tag=NNP] [lemma=□]
[lemma=investigator] [!tag=","] [tag=NNP] [lemma=van]
[lemma=investigator] [!tag=","] [tag=NNP] [lemma=investigator]
" This surprising observation led to a bit of challenging detective work to properly interpret the data , " said principal investigator Dr. Gerard van Belle of JPL . Scientists continue to analyze data received from Pioneer 10 's Geiger-Tube Telescope instrument operated by principal investigator Dr. James Van Allen of the University of Iowa . Scientific data received from Pioneer 10 's Geiger-Tube Telescope instrument are analyzed by original principal investigator Dr. James Van Allen of the University of Iowa , who discovered the Earth 's radiation belts bearing his name .