There are several different solutions. Here is one way to use flexbox utils ...
https://www.codeply.com/go/pB8HWQ0HCv
<div class="col-6">
<div class="card">
<div class="card-block">
Some other text goes here
</div>
<div class="card-block d-flex">
<img src="https://placehold.it/200x200" class="rounded-circle mr-4 my-auto" height="200">
<div class="second">
<h4 class="card-title mb-2">John Doe</h4>
<p class="card-text mb-2">Nam eget dui. Etiam rhoncus. Maecenas tempus, tellus eget condimentum rhoncus, sem quam semper libero, sit amet adipiscing sem neque sed ipsum. Nam quam nunc, blandit vel, luctus pulvinar, hendrerit id, lorem. </p>
<a href="#" class="btn btn-primary py-1 px-3">Click Here</a>
</div>
</div>
</div>
</div>
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