If you can get an interview, you have the academic credentials. What Exponent is interested in mostly is a fit of personality and a fit of culture.
First, you must be a dynamic, flexible, confident, and socially capable human being. This is definitely not true in many other 'technical' jobs, but it's true here.
Second, you must be a generalist. People who are focused on their own tiny area of research would not do well with the diversity of work Exponent performs, and are not hired.
Third, keep an open and fresh mind- your interviewers will probably begin by saying "So your background is in electronic thin films, right? Alright, I have a corroded shovel problem here for you to solve."
Finally, you must know how to communicate technical concepts clearly and concisely, without getting bogged down by details. Interviewers are not looking for technical mastery- they are looking for creative associations, problem-solving toolsets, and professional honesty.
Also...don't screw up the presentation. Prepare. Seriously.