Dispute Advisory & Expert Witness Services

20 years of experience in economic, financial and technical analysis in high-profile disputes

TOP 10 Expert Witness Firms
in the Oil&Gas industry and according to the average claim value
GAR 100 2025

 World-class consultants with solid & unique portfolio: over 50 international and local proceedings with damages up to $10B

We provide expert opinions and act as experts

Top-10 companies by market cap
in Russia
>$130B market cap corporations
headquartered in the US and Europe
Top-25 most traded companies
on the Nasdaq OMX Nordic Exchange Copenhagen
Public authorities
of CIS countries
GAR Testimonial (1)
“They provided excellent expertise characterized by very high attention to detail, accuracy and perfect presentation”
Source: Global Arbitration Review
High Court of Justice (2)
“The approach in this case has been a careful one undertaken by a very experienced and impressive valuer”
Source: High Court of Justice
High Court of Justice (3)
“Given Fidem's careful approach overall it is my judgment that their treatment of this factor is to be preferred”
Source: High Court of Justice

Dispute Advisory

We advise our clients on financial, economic, and technical aspects in disputes, prepare expert reports and undergo cross-examinations as expert witnesses under the rules of various arbitration centers and local courts:

Service offerings

  • Assessment of damages, including valuation and complex modelling
  • Price revision
  • Analysis of economic developments
  • Accounting treatment
  • Forensics and financial analysis
  • Mismanagement and fraud related matters
  • Quantum in construction
  • Delay analysis
>
50
cross-examinations in our experts' portfolio
>
130
expert reports prepared by our team
>
$
30
B
the amount of damage we have calculated
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Over $10B of damages: international investment arbitration proceedings

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Over $10B of damages: international investment arbitration proceedings

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$100M dispute between leading engineering company and Russian dry cargo sea terminal operator

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$100M dispute between leading engineering company and Russian dry cargo sea terminal operator

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$40M dispute between joint venture partners within the commercial real estate sector

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$40M dispute between joint venture partners within the commercial real estate sector

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Dispute concerning the revision of pricing terms in a long-term gas supply contract

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Dispute concerning the revision of pricing terms in a long-term gas supply contract

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Forensics & Crisis Management

We advise our clients on various forensic matters and crisis situations.

service offerings

  • Forensic accounting
  • Corporate investigation
  • Asset and cashflow tracing
  • Crisis management
  • Risk assessment
  • Fraud risk management
  • Conflict and independence check
  • Business intelligence
  • Compliance review
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Asset misappropriation: investigation concerning the Junior Managing Partner

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Asset misappropriation: investigation concerning the Junior Managing Partner

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Forensic review of the procurement function at a major fertilizers producer

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Forensic review of the procurement function at a major fertilizers producer

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Analysis of transactions between the owner and contractor of a large-scale mining and processing complex

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Analysis of transactions between the owner and contractor of a large-scale mining and processing complex

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Anti-crisis analysis of a gold mining company at the request of its newly appointed management team

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Anti-crisis analysis of a gold mining company at the request of its newly appointed management team

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Our group of experts is located in different places around the world: UK, Europe, Middle East and South East Asia

Our team has extensive experience advising clients around the globe.
The Carribean
6
countries
  • Cayman Islands
  • BVI
  • Dominica
  • St Kitts and Nevis
  • Grenada
  • Anguilla
South America
3
countries
  • Argentina
  • Chile
  • Venezuela
Europe
13
countries
  • Germany
  • United Kingdom
  • France
  • Italy
  • Switzerland
  • Poland
  • Denmark
  • Finland
  • Czech Republic
  • Lithuania
  • Cyprus
  • Andorra
  • Monaco
Balkans
8
countries
  • Romania
  • Slovakia
  • Bulgaria
  • Croatia
  • Slovenia
  • Serbia
  • Moldova
  • Montenegro
Russia and CIS
9
countries
  • Russia
  • Kazakhstan
  • Uzbekistan
  • Ukraine
  • Belarus
  • Azerbaijan
  • Turkmenistan
  • Moldova
  • Tajikistan
Middle East
8
countries
  • Saudi Arabia
  • Turkey
  • UAE
  • Kuwait
  • Oman
  • Bahrain
  • Lebanon
  • Yemen
Asia
3
countries
  • South Korea
  • Malaysia
  • Vietnam
Africa
11
countries
  • Nigeria
  • Egypt
  • South Africa
  • Algeria
  • Angola
  • DR Congo
  • Tanzania
  • Libya
  • Botswana
  • Niger
  • Seychelles
Alexey Perkov
Partner – Expert (UK)

Over 15 years of extensive experience in quantification and valuation of damages, construction disputes (quantum and technical expertise), forensic accounting and fraud investigations. Gets regularly appointed as an expert in a variety of arbitration (ICSID, HKIAC, UNCITRAL and other) and litigation cases.

Katerina Dyudina
Team Leader, Forensics & Investigations, Asset Tracing

Over 10 years of experience in forensics, risk assessment, asset tracing, and tax consulting. Expertise in business perimeter reconstruction, identifying beneficial owners and hidden affiliations, fraud investigations, market and competitor analysis, pre-M&A due diligence, and source of funds analysis.

Yulia Tsys
Team Leader, Forensics & Dispute Advisory

Over 10 years of experience in forensics, due diligence services, dispute advisory and litigation support. Specializes in the quantification and valuation of damages and losses in various types of disputes under the rules of ICC, UNCITRAL, as well as before local courts in Russia, England and Wales.

Mikhail Shvachko
Team Leader, Forensics & Dispute Advisory

Over 10 years of experience in audit and assurance, fraud investigations, dispute advisory and litigation support. Specializes in the quantification and valuation of damages and losses in disputes under the rules of ICC, LCIA, ICAC, UNCITRAL, and before local courts in Russia.

Anna Asadchaya
Team Leader, Forensics & Dispute Advisory

Over 15 years of experience in business valuation and corporate finance. Specializes in investment analysis, financial modeling, and business and asset valuation across various industries.

Yulia Pyreseva
Team Leader, Forensics & Dispute Advisory

Over 10 years of experience in audit and assurance, forensics, dispute advisory and litigation support. Specializes in quantifying and valuing damages and losses in disputes under the rules of ICC, LCIA, ICAC, UNCITRAL, and before local courts in Russia, CIS, England and Wales.

Yulia Dubovik
Team Leader, Forensics & Dispute Advisory

Over 10 years of experience in audit and assurance, forensics, disputes advisory and litigation support. Specializes in the quantification and valuation of damages and losses in various types of disputes under the rules of ICC, UNCITRAL and local courts in Cyprus and Sweden.

Vladimir Nefediev
Managing Partner - Expert (UAE)

Over 20 years of experience in forensics, crisis management, dispute advisory and litigation support. Gets regularly appointed as an expert on high-profile cases involving complex assessment of damages (some cases in excess of $4B).

Vladimir Nefediev
Anna Asadchaya
Yulia Pyreseva
Yulia Dubovik
Alexey Perkov
Mikhail Shvachko
Katerina Dyudina
Yulia Tsys
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Vladimir Nefediev

Managing Partner - Expert (UAE)
Over 20 years of experience in forensics, crisis management, dispute advisory and litigation support. Gets regularly appointed as an expert on high-profile cases involving complex assessment of damages (some cases in excess of $4B).
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Alexey Perkov

Partner – Expert (UK)
Over 15 years of extensive experience in quantification and valuation of damages, construction disputes (quantum and technical expertise), forensic accounting and fraud investigations. Gets regularly appointed as an expert in a variety of arbitration (ICSID, HKIAC, UNCITRAL and other) and litigation cases.
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Anna Asadchaya

Team Leader, Forensics & Dispute Advisory
Over 15 years of experience in business valuation and corporate finance. Specializes in investment analysis, financial modeling, and business and asset valuation across various industries.
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Mikhail Shvachko

Team Leader, Forensics & Dispute Advisory
Over 10 years of experience in audit and assurance, fraud investigations, dispute advisory and litigation support. Specializes in the quantification and valuation of damages and losses in disputes under the rules of ICC, LCIA, ICAC, UNCITRAL, and before local courts in Russia.
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Katerina Dyudina

Team Leader, Forensics & Investigations, Asset Tracing
Over 10 years of experience in forensics, risk assessment, asset tracing, and tax consulting. Expertise in business perimeter reconstruction, identifying beneficial owners and hidden affiliations, fraud investigations, market and competitor analysis, pre-M&A due diligence, and source of funds analysis.
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Yulia Pyreseva

Team Leader, Forensics & Dispute Advisory
Over 10 years of experience in audit and assurance, forensics, dispute advisory and litigation support. Specializes in quantifying and valuing damages and losses in disputes under the rules of ICC, LCIA, ICAC, UNCITRAL, and before local courts in Russia, CIS, England and Wales.
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Yulia Dubovik

Team Leader, Forensics & Dispute Advisory
Over 10 years of experience in audit and assurance, forensics, disputes advisory and litigation support. Specializes in the quantification and valuation of damages and losses in various types of disputes under the rules of ICC, UNCITRAL and local courts in Cyprus and Sweden.
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Yulia Tsys

Team Leader, Forensics & Dispute Advisory
Over 10 years of experience in forensics, due diligence services, dispute advisory and litigation support. Specializes in the quantification and valuation of damages and losses in various types of disputes under the rules of ICC, UNCITRAL, as well as before local courts in Russia, England and Wales.

Proven excellence: Debut in GAR 100 – Expert Witnesses 2025

Fidem Research Group has been ranked among the world’s leading expert witness firms in the Global Arbitration Review

Proven excellence: Debut in GAR 100 – Expert Witnesses 2025
August 12, 2025

Alexey Perkov – a new partner and expert at Fidem

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June 19, 2025

We sponsored students participation in the law competition in Hong Kong

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February 11, 2025

$40M case – significant win for our client

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November 28, 2024

Economic experts in arbitrations – new horizons and challenges

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