I would like to know if I should omit an article in front of a title. For example,
NPR's Michel Martin speaks with American University professor Allan Lichtman about the prediction he made two years ago that President Trump will be impeached. NPR
Here, there is no article.
Migrant children face bleak conditions at detention facilities along the border. Warren Binford, a law professor who visited some of the facilities, speaks to NPR's Lulu Garcia Navarro. NPR
Here, it has A.
And here again, there is no article:
NPR's Ari Shapiro speaks with E.J. Dionne of The Washington Post and Eliana Johnson of Politico about Labor Secretary Alexander Acosta's resignation, infighting in the Democratic party and the census.NPR
How can I know if I need to use a or the in front of a title?
Please help me. Thanks.