This morning the Holy See announced that the Pope has appointed 58-year-old Bishop Nelson J. Perez as the 10th Archbishop of Philadelphia succeeding Archbishop Charles Chaput, OFM, Cap. who has served as the 9th Archbishop since 2011 and who turned 75 last September. The Archbishop-elect was born in Cuba, emigrated with his family to Miami when he was a child and was raised in Northern New Jersey.
He was ordained a priest for the Archdiocese of Philadelphia in 1989. In 2012 Pope Benedict appointed him as Titular Bishop of Catrum and Auxiliary Bishop of Rockville Centre, New York. Pope Francis translated him to the Diocese of Cleveland in July, 2017.
His personal arms were assumed at the time he was ordained a bishop on Long Island. The reflect his Cuban heritage (the sun), his home diocese of Philadelphia (the star) and his vision of priestly and episcopal ministry (the lamb).
Philadelphia hasn’t had a priest of their own diocese serve as archbishop there since Archbishop Prendergast (1911-1918) so this is a momentous appointment for the archdiocese to have, if not a native son, a priest from their own presbyterate as their new shepherd. That’s relatively rare in the U.S. these days. I grew up in the Diocese of Rockville Centre and I still have many friends and some family there. I know the people there appreciated Archbishop-elect Nelson’s personality, style and his ministry with them.
Ad Multos Annos!
EXARANDORUM 
Is it permissible to adjust the size of the charges to make a more symmetrical design when painting the coat of arms? For example, could the fess sable on the dexter be made wider to match the sinister? Or could the mullet argent on the dexter be made larger to match it on the sinister? I realize that symmetry is not always desired but one also wants a pleasing design.
Probably. When the official rendering of his arms is prepared I’m sure they will.