Unlike typical literary celebrities, who are ever so eager to promote their work, even at the expense of coming across as contrived, chase was and made no effort to be expansive.

Chase was reserved and retiring and made no effort to be expansive.

Explanation:

The idea that something more than the usual work needs to be done for the promotion of the work, did not interest Chase.It can be said that it was his belief that putting in more efforts in promoting the work was not worth the time and expense. Rather, he preferred keeping himself aloof from the work once it was accomplished.