Is "considering taking" grammatically correct?

I've seen the following sentence in a newspaper. Is it grammatical?

He's considering taking early retirement.

Taking = present progressive was used near another present progressive?

Yes, it's grammatical. Considering is part of the finite present progressive construction is considering. Taking is not a present progressive form, but a non-finite verb form.

thefreedictionary.com page on consider states the following:

You can say that someone is considering doing something in the future.

• They were considering opening an office on the West Side of the city.
• He was considering taking the bedside table downstairs.

Be Careful!

Don't say that someone 'is considering to do' something.

Collins COBUILD English Usage © HarperCollins Publishers 1992, 2004, 2011, 2012