Profile
Diana Katumbi Ngei is the Managing Partner of Paul and Ngei Advocates and an Advocate of the High Court of Kenya with over seven (7) years of active legal practice.
She has extensive experience advising multinational corporations, financial institutions, State corporations, regulatory authorities, public institutions and private clients on corporate and commercial law, litigation, banking and finance, conveyancing, employment law, insolvency, competition law, Intellectual property law, data protection, governance and regulatory compliance.
Prior to co-founding the Firm, Diana practised at Munyao, Muthama & Kashindi Advocates where she progressed from Law Intern to Associate Advocate, gaining significant experience in high-value commercial transactions and complex litigation.
She is recognised for her strategic thinking, commercial awareness and practical legal solutions that align legal advice with business objectives. Diana’s professional excellence has earned her industry recognition as one of The Lawyer Africa’s Next Top 100 Litigation Lawyers in Kenya (2026), acknowledging her exceptional advocacy, strategic litigation practice and contribution to the development of Kenya’s legal profession.
Practice focus
Commercial litigation
Corporate & commercial law
Banking & finance
Employment & labour law
Intellectual property
Data protection
Competition law
Conveyancing
Insolvency
Regulatory compliance
Professional qualifications
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Advocate of the High Court of Kenya
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Postgraduate Diploma in Law – Kenya School of Law
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Bachelor of Laws (LL.B) – Moi University
Professional memberships
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Law Society of Kenya
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Former Member, Law Society of Kenya Public Litigation, Legal Aid & Human Rights Committee (2022–2024)
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Member, Law Society of Kenya Rule of Law and Litigation Committee (2026–2028)
Selected experience
Matters handled
Commercial litigation
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Successfully prosecuted a Kshs. 19 Million debt recovery claim for Henkel Kenya Limited.
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Successfully represented Moi Teaching and Referral Hospital in recovering approximately Kshs. 72 Million arising from breach of contractual payment obligations.
Regulatory & public law
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Successfully represented the Energy and Petroleum Regulatory Authority (EPRA) in public interest litigation concerning electricity tariffs and consumer protection, and continues to act in appellate proceedings.
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Participated in Regulatory Impact Assessments for draft regulations on behalf of the Agriculture and Food Authority (AFA).
Intellectual property & brand protection
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Successfully acted in a high-profile trademark infringement and intellectual property dispute involving Proto Energy Limited and Oto Energy Limited, advising on the protection and enforcement of trademark rights, brand identity and intellectual property interests. The matter involved complex issues of trademark infringement, passing off, unfair competition and the protection of valuable commercial goodwill.
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Advises corporate clients on intellectual property protection, including trademarks, copyrights, branding, licensing, enforcement of intellectual property rights, infringement disputes and strategies for protecting commercial goodwill and intangible assets.
Competition & consumer protection
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Part of the legal team representing Safaricom PLC in a class action involving competition and consumer protection law.
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Advised Henkel Kenya Limited on competition law compliance relating to distributorship arrangements.
Data protection & privacy
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Advised PZ Cussons East Africa Limited and other entities on compliance with the Data Protection Act, 2019, including governance, cross-border transfers, lawful processing and privacy risk management.
Maritime law
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Represented the Owners of MV ATA-M in proceedings arising from the arrest of the vessel at Kilindini Port, Mombasa, and successfully secured the vessel’s release, protecting the Owners’ commercial interests and enabling the vessel to resume operations.
Employment & labour law
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Successfully represented Unilever Kenya Limited in complex employment and labour disputes before the Employment and Labour Relations Court, providing strategic litigation, legal advisory and dispute resolution services while safeguarding the client’s commercial and employment interests.
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Conducted comprehensive reviews and revision of Human Resource Manuals, employment policies and workplace procedures for various corporate entities and institutions to ensure compliance with the Employment Act, 2007, labour regulations, constitutional principles and emerging workplace best practices.
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Drafted and reviewed employment contracts, executive service agreements, consultancy agreements, workplace policies and employee handbooks for private companies and public institutions.
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Represented various employers in employment and labour litigation involving claims for unfair termination, discrimination, employee benefits, contractual disputes and enforcement of employment obligations.
Banking & finance
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Acted for KCB Bank Kenya Limited, National Bank of Kenya, Mhasibu SACCO, Kenya Pipeline Company PLC and other institutions in secured lending transactions.
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Successfully advised the Parliamentary Service Commission in structuring and securing a mortgage transaction valued at over Kshs. 35 Million.
Corporate governance
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Conducted governance and compliance audits for Standard Group PLC, EPRA, KDIC, KenTrade, BOC Gases Kenya PLC and Kenya Post Office Savings Bank.
Conveyancing & property
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Managed complex conveyancing transactions, security perfection and property transfers for corporate and institutional clients, including the Agriculture and Food Authority.
Regulatory & road transport litigation
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Successfully represented the family of the late Eugene Mutuku, a KMTC student who tragically lost his life in a road traffic accident in June 2026 involving a vehicle operated by Nicco Movers Limited. Following the incident and the operator’s failure to comply with safety concerns and directives issued by the National Transport and Safety Authority (NTSA), the firm successfully obtained orders suspending Nicco Movers Limited’s PSV Operating Licence.
The above includes representative matters handled by members of the Firm during the course of their professional practice.
Instruct Diana
Email directly or call the office on +254 710 417 338 and ask for Diana.