In Lenore Thomson's theory, the four-letter code "ISTJ" stands for a person with:
Introverted Sensation as their Dominant Function
Extraverted Thinking as their Secondary Function
Introverted Feeling as their Tertiary Function
Extraverted Intuition as their Inferior Function
Profiles
Bearing in mind the Classification Mismatches, here are:
Joe Butt's ISTP profile
David Keirsey's ISTP profile
Brenda Muller's ISTJ profile
Hirsch and Kummerow's ISTJ profile
Hale's ISTJ profile