Claes Reimerthi is a Swedish comic writer, having worked with characters such as The Phantom

The Phantom

The Phantom is an American adventure comic strip created by Lee Falk, also creator of Mandrake the Magician. A popular feature adapted into many media, including television, film and video games, it stars a costumed crimefighter operating from the fictional African country Bengalla.The Phantom is...

 and Bamse

Bamse

Bamse – Världens starkaste björn is a Swedish cartoon created by Rune Andréasson. The highly popular children's cartoon first emerged as a series of television short films as well as a weekly half page Sunday strip in 1966, before being published periodically in its own comic magazine since...

. Reimerthi has written more than 100 stories about The Phantom and is a member of Team Fantomen, the Swedish "braintrust" that set the line of what is going to happen to The Phantom.

During the 1980s he primarily used the pseudonym Michael Tierres for his work, and periodically he has also used Frans Möller.