Svante Janson,
... that mathematician Lennart Carleson received his Ph.D. when he was 22 years old and later supervised the thesis of Svante Janson, who received his first Ph.D. on his 22nd birthday?
... that mathematician <a href="./Lennart_Carleson" id="mwGDg" rel="mw:WikiLink" title="Lennart Carleson">Lennart Carleson</a> received his <a class="mw-redirect" href="./Ph.D." id="mwGDk" rel="mw:WikiLink" title="Ph.D.">Ph.D.</a> when he was 22 years old and later <a href="./Doctoral_advisor" id="mwGDo" rel="mw:WikiLink" title="Doctoral advisor">supervised</a> the <a class="mw-redirect" href="./Doctoral_dissertation" id="mwGDs" rel="mw:WikiLink" title="Doctoral dissertation">thesis</a> of <b id="mwGDw"><a href="./Svante_Janson" id="mwGD0" rel="mw:WikiLink" title="Svante Janson">Svante Janson</a>,</b> who received his first Ph.D. on his 22nd birthday?