Where do you find the Author's Credentials?
If your source is a book, look for an author’s note, a foreword, or an “about the author” section towards the beginning or the end of the book. Book reviews can also be a good place to find information about the author. If your source is a website, look for an “About Me” section. Books and articles might also identify the author’s university affiliation or academic credentials (advanced degrees, etc.). If so, you can use this information in a general Internet search (remember when you Google someone put their name in quotation marks "Laura Karas") to find a university-hosted biography page or a professional LinkedIn profile. If the author is a university professor, they may also have a published curriculum vitae (a curriculum vitae or CV is like a resume, it is a detailed account of your professional and educational history.) that you can find online.
It's common for scholarly works to have more than one author, research is often a group process.
Search in Google Scholar for your article then look to see if the author is linked to their profile page. Most Authors have created a profile that offers affiliations and links to other of their articles.
Google Scholar is also a good place to see if and how often an author has been cited or referred to by others in the field. This is a way to see if other researchers feel the author has merit in the field
LinkedIn is a professional networking site that allows you to search and find a profile that can include authors' contact information, education, licenses & certifications, skills & endorsements as well as publications if available.
ResearchGate is a European commercial social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators. You can either go to the site directly or google the author's name and SITE: researchgate.net to get to the Authors profile page.
Scopus is the world's largest abstract and citation database of peer-reviewed research literature. With over 22,000 titles from more than 5,000 international publishers. You can use the free author lookup to search for any author.
Scopus also offers statistics or metrics of how many documents the author has created, how many times it was cited as well as other information. Not all of the information is in the free version but you can see the basic numbers and key ideas.