Final answer:
Ulysses S. Grant was the President during the Credit Mobilier and Whiskey Ring scandals.
Step-by-step explanation:
The President during the Credit Mobilier and Whiskey Ring scandals was Ulysses S. Grant. The Credit Mobilier scandal involved the construction company Crédit Mobilier of America and the Union Pacific Railroad. Crédit Mobilier received money to build the railroad but used it to buy Union Pacific Railroad bonds and resell them at a profit. The Whiskey Ring scandal involved the siphoning off of money from excise taxes on whiskey. People at the highest levels of the Grant administration, including his personal secretary, were involved in these scandals.