
The Imperial name was first used in the mid-1920s. It was Chrysler's top of the line model. Throughout it's life the Imperial featured Chrysler's latest and greatest in technology. In 1934 Chrysler used it to introduce the Airflow design, which, while a sales failure in its day, is considered to be one of the most advanced cars of its time.
In 1955 Chrysler made Imperial a separate brand, designed to compete with Cadillac and Lincoln. Imperials were titled as Imperials, not Chryslers. They blundered, in my opinion, by not setting up separate Imperial showrooms. Imperials were sold in Chrysler showrooms, side by side with more mundane Chrysler models.
Imperials were not mundane and this car is proof...

The Mobile Director option is rare. It was only offered on the coupe, as the B-pillar would have been in the way of the swiveling seat on a 4 door. That was part of the sales problem. In the 1960s, executives who were driven to work wanted to be seen in a huge 4 door limo, not a huge 2 door coupe.
It's interesting and amusing to look at this car. First of all, there's the safety factor. How many execs would use the lap belt while the seat was turned around? (Shoulder belts weren't mandatory in cars in 1967.) I suspect very few. Not to mention that by sitting "backwards" you'd be unable to see an accident about to happen and have any time to brace yourself. Even if you did, what would you grab? The table? The light? The secretary?
But, on the interesting side, this car represents a time when US manufacturers actually tried to make their cars unique. Did Lincoln and Cadillac have a coupe with a swiveling seat, a table and a light? Nope. If you found this idea appealing and/or necessary you had to buy an Imperial. It was unique to the Imperial.
The Mobile Director option was hoaky as hell. In reality is was pretty useless. Still, the fact that Chrysler offered it showed a level of competitive thinking that has been lost by US car manufacturers today.

The "Imperial Web Pages" has some more info and some great pictures. You can find it here.