Final answer:
Geert Hofstede undertook a famous study in cross-cultural psychology, exploring cultural differences in values, behaviors, institutions, and organizations across nations.
Step-by-step explanation:
Geert Hofstede undertook what is probably the most famous study in cross-cultural psychology. He conducted a large-scale research project to understand cultural differences in values, behaviors, institutions, and organizations across nations. This study resulted in his book, titled 'Culture's Consequences: Comparing values, behaviors, institutions, and organizations across nations'.