There are opposite rules for torts and breaches of contract.
Torts
The general rule in Oregon, and almost all other U.S. jurisdictions is that if you personally participate in a civil wrong (e.g. a "tort") you are legally responsible, even if you commit the civil wrong in the course of your employment.
The widespread myth that an employee working for a corporation is immune from liability for their wrongful conduct while working for their employer is not true.
Sometimes someone who is harmed by tortious conduct of a corporate employee (e.g. negligently causing an accident) is not sued individually, because the employee is judgment proof and employers and principals are vicariously liable for the acts of their employees and agents acting within the scope of their official duties under a legal principle called respondiat superior. It is also usually harder to prove than a particular employee was at fault than it is to prove that someone working for the employer was at fault. In tort law, "corporate personhood" is a pro-victim policy and not a policy that protects corporations.
Thus, the employer is legally responsible for the acts of an employee done in the course of the employer's business even if the employer's management did nothing wrong and the employee was violating company policy or disobeying management regarding the manner in which the employee's duties were to be carried out.
On the other hand, in some circumstances, the employer or principal will have a legal duty to indemnify (i.e. pay judgments against) and defend (i.e. hire lawyers to fight lawsuits against) the employee against lawsuits arising out of the employee's tortious conduct in the course of the employee's official duties for the employer or principal (and the employee is often covered by the employer's insurance policies in this situation). This is the norm in the case of corporate officers, corporate directors, and unionized law enforcement officers in the United States.
Contracts
On the other hand, employees and agents of disclosed employers and principals do not have contractual liability for the employer or principal's contracts, even if the employee or agent was the person who signed the contract on behalf of the employer or principal, and even if the employee or agent was the person who caused the contract to be breached.
For example, if an employee signs a lease in the name of the employer, and then causes the employer to violate some term of the lease (e.g. by keeping a store open after landlord approved hours) the landlord can't sue the employee for breaching the lease, the landlord can only sue the employer-tenant (unless the employee personally guaranteed the lease).
However, if the contract contains representations of fact that are fraudulent, the employee who affirmed the representations on behalf of the employer will usually have personal liability for the fraud committed, which is a tort, even though the employee will not have liability under the contract itself.
Also, sometimes a breach of a contract between an employer and a third-party actually caused by an employee will also be a breach of the duties that the employee owes to the employer, in which case the employer can sue the employee, even though the third-party cannot sue the employee directly.
Special Statutory Liability Cases
There are also in between cases in instances where legal liability arises out of statutes.
For example, in tax law, usually only the employer is responsible for paying taxes, but an employee who is responsible for handling withholding taxes and payroll is also personally responsible if withholding taxes are not paid.
Similarly, in employment law, managers and payroll officials can be held personally responsible for failure to pay minimum wage and overtime under the Fair Labor Standards Act, even though not all employees are responsible for these violations and even though the contractual employment relationship whose terms were illegal is with the employer and not the employee.
As a third example, members of a corporate board of directors often have personal liability for distributing dividends to shareholders when the corporation is insolvent, to unpaid creditors, even though usually, members of a corporate board of directors are not personally responsible for paying the corporation's creditors.
Shield Laws Are Something Different
Oregon has a "shield law" but this is a form of evidentiary privilege available to reporters and is not related to tort liability.
Oregon’s shield law, ORS 44.510 through ORS 44.540, provides broad
protection for reporters and others against compelled testimony,
production of evidence and searches.
This law protects people connected with, employed by or engaged in a
medium of public communication, including print and broadcast media,
books, periodicals, pamphlets, wire services or feature syndicates.
The protection extends beyond information related to news and includes
unpublished notes, out-takes, photographs, tapes or other information,
regardless of whether it is related to published information.
The statutes protect reporters from being compelled to disclose: (1) a
source of information obtained in the course of work, regardless of
whether the information has been published; and (2) unpublished
information obtained or gathered in the course of work. Reporters also
are protected from searches of their papers, effects or work premises,
unless there is probable cause to believe the reporter has committed,
is committing or is about to commit a crime.
The protection is not limited to situations where a relationship or
pledge of confidentiality exists. The protection is not lost if the
reporter: (1) disclosed the information, source or related information
elsewhere; or (2) ceases to be connected with, employed by or engaged
in a medium of public communication.
Of course, the shield law, like most legal principles, has some exceptions.