Neasa joined Carson McDowell as a partner in 2010 and became Senior Partner in 2019.

Neasa’s corporate practice focuses on mergers and acquisitions, private equity and venture capital fund raisings, joint-ventures and corporate finance. She has over 21 years’ experience as a corporate lawyer, throughout her career in Dublin and Belfast, with particular experience working across various sectors but specialising in the energy and technology sectors.

Neasa is recognised as a "leading individual" and in the "hall of fame" by The Legal 500, in which she is noted as a key name for energy and private equity work.

She is also ranked Band 1 in Chambers UK, where she is described as "a strong corporate lawyer with a good attention to detail." Sources appreciate her "good quality of work and market activity." The "highly knowledgeable, technical and very experienced" Neasa "helps to complete deals in a timely manner and to budget." An impressed client remarked: "She has a very good reputation for energy M&A."

Neasa is a committee member of the CBI Regional Council in Northern Ireland and the Northern Ireland Renewables Industry Group.