Can I research and publish in my Masters field when my PhD is in an unrelated field? I have a PhD in Business with an emphasis in Political Marketing and a Masters in Linguistics. 

Now due to some personal and life circumstances, I would like to start collaborating in research about Linguistics and second language acquisition. 

My question is, can I initiate or collaborate on research and publish my work in a completely different field than my PhD?
If you can perform some research and write it up with the result that a journal wants to publish it, then it doesn't matter what qualifications you have, if any at all! Many journals do blind reviews which means their reviewers don't know the qualifications of any of the papers they review.