You know you can follow the tweet to learn more about the author, right?

That "random person" is Trisha Greenhalgh - Professor of Primary Care Health Sciences at the University of Oxford.

Here's an excerpt from her Oxford Uni profile:
Trish is the author of over 400 peer-reviewed publications and 16 textbooks. She was awarded the OBE for Services to Medicine by Her Majesty the Queen in 2001, made a Fellow of the UK Academy of Medical Sciences in 2014, and elected an International Fellow of the US Academy of Medicine in 2021. She is also a Fellow of the UK Royal College of Physicians, Royal College of General Practitioners, Faculty of Clinical Informatics and Faculty of Public Health.
https://www.phc.ox.ac.uk/team/trish-greenhalgh

Her Google Scholar profile shows that her work has been cited almost 95,000 times in other research papers.
https://scholar.google.co.uk/citations?sortby=pubdate&hl=en&user=8KQwEGcAAAAJ&view_op=list_works