which drove an increase of $30.8 million in cost of products, $3.8 million in marketing costs, $0.4 million in consulting fees, and $0.3 million in personnel and related costs. Society6 Group operating contribution was $7.3 million for the nine months ended September 30, 2020, as compared to ($0.1) million in the same period in 2019.
Saatchi Art Group Operating Expenses and Operating Contribution
Saatchi Art Group operating expenses for the three months ended September 30, 2020 increased by $0.3 million, or 7%, to $4.8 million, as compared to $4.4 million in the same period in 2019. The increase was primarily due to an increase in Saatchi Art Group revenue, which drove an increase of $0.3 million in cost of services. Saatchi Art Group operating contribution was ($0.1) million for the three months ended September 30, 2020, as compared to ($0.3) million in the same period in 2019.
Saatchi Art Group operating expenses for the nine months ended September 30, 2020 decreased by $0.5 million, or 4%, to $13.1 million, as compared to $13.7 million in the same period in 2019. The decrease was primarily due to decreases of $0.3 million in travel and entertainment costs, $0.2 million in personnel and related costs, $0.2 million in consulting fees, and $0.2 million in marketing costs, partially offset by increases of $0.4 million in cost of services. Saatchi Art Group operating contribution was ($1.7) million for the nine months ended September 30, 2020 and the same period in 2019.
Media Group Operating Expenses and Operating Contribution
Media Group operating expenses for the three months ended September 30, 2020 decreased by $1.2 million, or 12%, to $8.8 million, as compared to $10.0 million in the same period in 2019. The decrease was primarily due to a decrease of $0.9 million in content fees, $0.2 million in marketing costs, and $0.2 million in travel and entertainment costs, partially offset by an increase of $0.2 million in personnel and related costs and $0.3 million in facilities costs. Media Group operating contribution was $6.1 million for the three months ended September 30, 2020, as compared to $6.7 million in the same period in 2019.
Media Group operating expenses for the nine months ended September 30, 2020 decreased by $2.8 million, or 10%, to $26.8 million, as compared to $29.6 million in the same period in 2019. The decrease was primarily due to decreases of $0.8 million in content fees, $0.8 million in marketing costs, $0.6 million in personnel and related costs, $0.3 million in travel and entertainment costs, $0.2 million in cost of sales, $0.2 million in professional fees, $0.2 million in office supplies, partially offset by an increase of $0.7 million in facilities. Media Group operating contribution was $14.6 million for the nine months ended September 30, 2020, as compared to $16.9 million in the same period in 2019.
Strategic Shared Services and Corporate Overhead
Strategic shared services and corporate overhead for the three months ended September 30, 2020 remained flat at $7.2 million, as compared to the same period in 2019.
Strategic shared services and corporate overhead for the nine months ended September 30, 2020 decreased by $1.5 million, or 7%, to $20.9 million, as compared to $22.3 million in the same period in 2019. The decrease was primarily due to decreases of $0.8 million in personnel and related costs, $0.6 million in travel and entertainment costs, $0.4 million in consulting fees, $0.3 million in stockholder activist-related costs, and $0.3 million in board fees. These savings were partially offset by increases of $0.5 million associated with strategic review costs, including fees of legal, financial and other advisors, and $0.2 million in software licensing costs. For the nine months ended September 30, 2020, we had $0.9 million and $0.7 million in costs related to the strategic review and stockholder activist-related costs, respectively, as compared to $0.5 million and $1.0 million in the same period in 2019.
Non-GAAP Financial Measures
To provide investors and others with additional information regarding our financial results, we have disclosed in the table below adjusted earnings before interest, taxes, depreciation and amortization expense, or Adjusted EBITDA. We have provided a reconciliation of this non-GAAP financial measure to net income (loss), the most directly comparable GAAP financial measure. Our Adjusted EBITDA financial measure differs from GAAP net income (loss) in that it excludes interest expense (income), income tax expense (benefit), and certain other non-cash or non-recurring items impacting net income (loss) from time to time, principally comprised of depreciation and