Craft entries by author

{% set username = craft.request.getSegment(3) %}

{% set author = craft.users.username(username).first() %}

<p>Articles written by <strong>{{ author.firstName }} {{ author.lastName }}</strong></p>

{% paginate craft.entries.section('blog').limit(5).authorId(author.id) as entries %}
  {% for entry in entries %}
  <article>
    <h1><a href="{{ entry.url }}">{{ entry.title }}</a></h1>
    <div class="meta">
      <span class="date">{{ entry.postDate|date("F d, Y") }}</span> | 
      <a href="">{{ entry.author }}</a>
    </div>
    {{ entry.body }}
  </article>
  {% endfor %}
      <div class="article-pagination">
    {% if paginate.prevUrl %}
    <a href="{{ paginate.prevUrl }}" class="newer ss-navigateleft">Newer Articles</a>
    {% endif %}
    {% if paginate.nextUrl %}
    <a href="{{ paginate.nextUrl }}" class="older ss-navigateright right">Older Articles</a>
    {% endif %}
  </div>
{% endpaginate %}