One of the nation’s most influential psychiatrists earned more than $2.8 million in consulting arrangements with drug makers from 2000 to 2007, failed to report at least $1.2 million of that income to his university and violated federal research rules, according to documents provided to Congressional investigators.

The psychiatrist, Dr. Charles B. Nemeroff of Emory University, is the most prominent figure to date in a series of disclosures that is shaking the world of academic medicine and seems likely to force broad changes in the relationships between doctors and drug makers.

In one telling example, Dr. Nemeroff signed a letter dated July 15, 2004, promising Emory administrators that he would earn less than $10,000 a year from GlaxoSmithKline to comply with federal rules. But on that day, he was at the Four Seasons Resort in Jackson Hole, Wyo., earning $3,000 of what would become $170,000 in income that year from that company  17 times the figure he had agreed on.

The Congressional inquiry, led by Senator Charles E. Grassley, Republican of Iowa, is systematically asking some of the nation’s leading researchers to provide their conflict-of-interest disclosures, and Mr. Grassley is comparing those documents with records of actual payments from drug companies. The records often conflict, sometimes starkly.