Agar leaves his current role as graphics editor for the Independent on Sunday, a position he has held for three years.
"Michael is renowned in the field of graphic journalism both in the UK and abroad and he is an excellent signing for TMG. I'm delighted that he is going to head up our team at a time when we are seeking to expand the range and quality of our graphic content across both print and online," said Himesh Patel, creative director at Telegraph Media Group, in a press release.
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