Ravil Kassilgov founded Kassilgov & Partners (KP) in 2015, following nine years of practice at Kazakhstan’s first law firm. For five years, KP focused on helping businesses navigate complex disputes. In 2020, Mr. Kassilgov, together with partners, co-founded Kazakhstan’s first litigation boutique. In February 2025, Mr. Kassilgov and Mr. Aibek Kambaliyev transitioned to KP, transforming it into a new firm - Kassilgov, Kambaliyev & Partners, operating under the KP Disputes brand.

Mr. Kassilgov specialises in tax and customs disputes, the protection of pharmaceutical companies against unfair competition, and challenging regulatory actions and decisions by state authorities. He is a member of the Kazakhstan Bar Association (KazBar) and has been elected Co-Chair of KazBar’s Tax Committee. He is also a KazBar Board Member. He is admitted to represent clients before the AIFC Court (Rights of Audience) and holds the status of Legal Adviser with the AIFC Legal Services Board.

Mr. Kassilgov also leads the Salyq Tax Consultants League, spearheads socially significant legal initiatives, actively shares his expertise through seminars and conference speaking, and publishes articles on legal issues.