You can use the Author Box in order to present the author of a post to the audience.
To enable that setting, go to Appearance > Customize > General Settings and toggle on the Show Author Box? option.
By default, the author box will show the author's Gravatar (see here on how to set one up), name and description. You can also choose to show links to their social media by adjusting the setting in the Customizer:
This is the sample appearance of the widget at the front end: