He is the son of Robin and Susan Weeks, and the brother of Honeysuckle Weeks and Perdita Weeks, also actors. His name means 'famous wolf', after his family's earliest traceable ancestor, a viking. He has been acting since the age of two.

He attended Sylvia Young's Theatre School and Stowe School.

His debut film was The Little Vampire (2000), which was directed by Ulrich Edel and earned Rollo a Young Artist Award nomination. Soon followed were roles in Girl With a Pearl Earring (2003) and The Queen of Sheba's Pearls (2004). Rollo's second turn as a title character came as Scipio in The Thief Lord (2006), a movie based on Cornelia Funke's novel The Thief Lord and directed by Richard Claus.[citation needed] Rollo has also appeared in two TV shows -Berkeley Square (1998) as Lord Louis Wilton and Goggle Eyes (1993) as Joseph.

The Thief Lord ....... (2006) Scipio

The Queen Of Shebas Pearls ..... (2004) Jack

George And The Dragon ........ (2004) Wryn

Girl With A Pearl Earing ...... (2003)Frans

The Lost Prince ......... (2003) George

Attilla....... (2003) Young Attilla

The Little Vampire ........ (2000) Rudolph

Goggle Eyes ........... (1993) Joseph

Berkeley Square ....... (1998) Lord Louis Wilton.