A selection of the companies for whom I have worked:
Copy-editing and proofreading books on literature, theology, history, music, law and social sciences.
Proofreading and copy-editing mathematics textbooks.
Copy-editing advanced mathematics textbooks in LaTeX.
Copy-editing educational material on information technology.
Copy-editing and proofreading material for mathematics and physics textbooks.
Copy-editing mathematics textbooks; proofreading subtitles for video material.
Copy-editing books on philosophy, mathematics, and science.
Copy-editing advanced economics textbooks.
Copy-editing of papers written in LaTeX for SAGE scientific journals covering areas such as robotics, high performance computing, and mathematics.
Copy-editing mathematics and research methods textbooks.