Denny's law firm represents several large corporations. As a senior corporate paralegal, Denny always has access to confidential information regarding the price of stock of those corporations, as well as the business deals those corporations are considering. Denny owns stock in one of the corporations that is represented by his firm. Because of his financial interest in that corporation, Denny spends most of his time doing work for that particular corporation while neglecting the others.

1. Is it permissible for Denny to have access to all the business deals of these corporations?
2. What actions should the law firm take once they find out Denny owns stock in one of the corporations?
3. Should Denny have disclosed his financial interest in the corporation as soon as he was assigned the case?