Professor Philip Syrpis is a Professor of EU Law at the University of Bristol Law School and has published academic research on a wide range of subjects relevant to Brexit.  On the triggering of Article 50, Professor Syrpis said:

We have heard a lot from Theresa May's government about the complexity of the task ahead, and of the need not to show our negotiating hand too early. We are however starting the process without a clear sense of what the rules of the game are.

You can hear more of Professor Syrpis’ thoughts on the Brexit process here:

In addition to his published academic research Professor Syrpis has written an article on the A50 process here: https://eutopialaw.com/2016/07/08/what-next-an-analysis-of-the-eu-law-questions-surrounding-article-50-teu-part-one/ 

He also contributed a podcast on the subject with The Guardian: https://www.theguardian.com/politics/audio/2016/dec/20/deciphering-article-50-brexit-means-podcast 

The University hosted a debate, chaired by Professor Syrpis, last year to discuss Brexit ahead of the Referendum vote which you can view here: https://www.youtube.com/watch?v=QWJ_Yue27v4