Walter Warwick Sawyer (or W.W. Sawyer) was a mathematician, mathematics educator and author, who taught on several continents.https://en.wikipedia.org/wiki/Walter_...
Prelude to Mathematics
W. W. Sawyer
Mathematician's Delight
W.W. Sawyer
What Is Calculus About?
Concrete Approach to Abstract Algebra
A First Look at Numerical Functional Analysis (Dover Books on ...
Vision in Elementary Mathematics (Dover Books on Mathematics)
Path to Modern Mathematics
The search for pattern (His Introducing mathematics, 3) (v. ...
Introducing Mathematics, Vol. 1: Vision in Elementary Mathematics
Mathematics in Theory and Practice