He is a prominent figure in these fields. He has published numerous scholarly articles  and books  on his research. Along with colleague Charles Reiss, he is a proponent of substance-free phonology, the idea that phonetic substance is inaccessible to phonological computation.
Hale, M. (2007), Historical linguistics: Theory and method, Oxford, Blackwell
Hale, M., Kissock, M., & Reiss, C. (2014) An I-Language Approach to Phonologization and Lexification. Chapter 20.
The Oxford Handbook of Historical Phonology.
Edited by Patrick Honeybone and Joseph Salmons
Hale, M. (1998). Diachronic syntax. Syntax, 1(1), 1-18.
Hale, M.,(2004) Neogrammarian Sound Change, Chapter 7 in The Handbook of Historical Linguistics, Edited by: Brian D. Joseph and Richard D. Janda, Blackwell
Mark Hale & Charles Reiss (2000) Substance abuse and dysfunctionalism: Current trends in phonology. Linguistic Inquiry 31: 157-169.