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Thanks. The cause of the extra blank page was a \cleardoublepage in book style, I think.

Everything works now.

Best,

Seth

Thanks much. OK, I tried titlesec (see MWE below) and it does what I want,
with two exceptions:
1) There is an unexplained blank page before the 2nd chapter.
How can I suppress it?
2) There is a lot of whitespace above each heading.
How can I suppress it?
Seth

\documentclass[12pt]{book ...

I wish to redefine chapter hedaings so that instead of rendering as it does now, i.e. as:

[page break]
[lots of whitespace]
Chapter \thechapter
[whitespace]
Foo
[lots of whitespace]

I would instead get

Chapter \thechapter{:} Foo % note no page or line break
[minimal whitespace]

I ...