Jessica and Harvey bring up the fact that the CM memo settlement they were all fighting for was in fact orchestrated by Daniel Hardman in a ploy to get rid of Harvey as well make Jessica surrender her leadership position, a fact Louis was unaware of.
When Jessica tells Daniel that fraudulently suing his own firm is a violation of their by-laws and therefore grounds for dismissal, every senior partner votes Daniel be kicked out, Louis included.
Upon Daniel's return to the firm, Louis is unsure who to work for, claiming he needs to follow a chain of command.
Jessica tells him that he responds to her, but as she clearly favors Harvey over him, Daniel uses that to his advantage, building a rapport with Louis.
In order to usurp control once more, Daniel needs to be voted in as the new managing partner, and decides to get Louis' vote by promoting him to senior partner, something Jessica never did.
His position at the firm was put under threat, however, when Harvey, under orders from Jessica, discovered evidence which seemed to suggest that Louis had been stealing from the company.
It was later revealed however, through Louis' own indirect assistance, that it was in fact Daniel that had been stealing money, and he had set Louis up to take the blame for his misdeeds.
He is an expert at Corporate Finance and is well known for his superb training of the associates.
Louis initially resigned from Pearson Specter to prevent Jessica or Harvey from firing him after he embezzled money for Charles Forstman, but after discovering that Mike Ross was a fraud and that the others covered it up, he used that information to blackmail Jessica into making him a name partner, thus forming Pearson Specter Litt. He graduated magna cum laude from Harvard University, achieving the Order of the Coif.