Born in Dublin to Irish and Nigerian parents, Leann grew up in the East End of London from the age of 4.
"A blazingly intense performance by O'Kasi...has energy and theatricality to burn" The Scotsman
She is a graduate of the Royal Central School of Speech and Drama.
On screen, Leann has appeared alongside Gregor Fisher and
Tony Roper in series 10 of the BAFTA award-winning BBC2 sitcom Rab C.
Nesbitt and with Gangs of New York actor Gary
Lewis in short Last Order written by Raisah Ahmed.
Stage work includes projects with BBC Writersroom and Live Theatre, Citizens Theatre, Ice & Fire, Arcola Theatre, Brighton Dome, Southwark Playhouse, National Theatre of Scotland and Theatre503. She is an associate artist with Crosspath Theatre founded by Queen's Gold Medalist poet John Agard.
Leann has voiced award-winning HIV and AIDS documentary Condom Commandos winner of the Gold award at the Chicago International Film Festival. She has also voiced the title role in animated short film Sara's Story nominated for The Herald Scottish Digital Business Awards.
Leann was previously Artist in Residence at the Tron Theatre where she wrote and performed one
woman play Dirty Paradise inspired by the work of Gabriel García Márquez. The
play received 4 star reviews from The Scotsman and The Herald publications and
features in the book Mental Illness in Popular Media: Essays on the
Representation of Disorders Edited by Lawrence Rubin.
Leann was shortlisted for the Hospital Club Emerging Creatives Programme in 2019.
Leann is represented by Actors International Ltd.
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