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 in Legal 500 and ranked in Chambers and Partners UK where she is described as an "utterly reliable" solicitor who has "reinvigorated practice" since her arrival from another Belfast law firm. She is also described as "exceptional", "very professional", and "very commercially aware".

The Chambers and Partners UK Guide 2020 describes Neasa as a "superbly calm partner". She handles a wide range of transactions involving the energy and technology sectors. Neasa is mentioned as being "very practical, easy to deal with and a most knowledgeable person" and is held in high regard for her combined corporate and energy expertise.

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