EXHIBIT 24

                                POWER OF ATTORNEY

                  FOR SEC FILINGS ON FORMS ID, 3, 4, 5 AND 144
                           IN RESPECT OF SECURITIES OF
                            THE RUBICON PROJECT, INC.

               The undersigned hereby constitutes and appoints Todd Tappin,
Brian Copple, David Day and Jonathan Feldman, and each of them, as his true and
lawful attorney-in-fact and agent, with full power of substitution and
resubstitution for his in his name and stead in any and all capacities, to sign
and file for and on his behalf, in respect of any acquisition, disposition or
other change in ownership of any Common Stock of The Rubicon Project, Inc. (the
"Company"), the following:

       (i)     any Form ID to be filed with the Securities and Exchange
               Commission (the "SEC");

       (ii)    any Initial Statement of Beneficial Ownership of Securities on
               Form 3 to be filed with the SEC;

       (iii)   any Statement of Changes of Beneficial Ownership of Securities
               on Form 4 to be filed with the SEC;

       (iv)    any Annual Statement of Beneficial Ownership of Securities on
               Form 5 to be filed with the SEC;

       (v)     any Notice of Proposed Sale of Securities on Form 144 to be filed
               with the SEC; and

       (vi)    any and all agreements, certificates, receipts, or other
               documents in connection therewith.

               The undersigned hereby gives full power and authority to the
attorney-in-fact to seek and obtain as the undersigned's representative and on
the undersigned's behalf, information on transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release such information to the undersigned and approves and ratifies
any such release of information.

               The undersigned hereby grants unto such attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary in connection with such matters and hereby ratifies and
confirms all that any such attorney-in-fact and agent or substitute may do or
cause to be done by virtue hereof.

               The undersigned acknowledges that:

       (i)     neither the Company nor such attorney-in-fact assumes (i) any
               liability for the undersigned's responsibility to comply with the
               requirement of the Securities Exchange Act of 1934, as amended
               (the "Exchange Act"), (ii) any liability of the undersigned for
               any failure to comply with such requirements or (iii) any
               obligation or liability of the undersigned for profit
               disgorgement under Section 16(b) of the Exchange Act; and

       (ii)    this Power of Attorney does not relieve the undersigned from
               responsibility for compliance with the undersigned's obligations
               under the Exchange Act, including without limitation the
               reporting requirements under Section 16 of the Exchange Act.

               This Power of Attorney shall remain in full force and effect
until revoked by the undersigned in a signed writing delivered to such
attorney-in-fact.

               IN WITNESS WHEREOF, the undersigned has executed this Power of
Attorney.

Date:  March 18, 2014                   /s/ Frank Addante
                                        ----------------------------------------
                                        Frank Addante
                                        Chief Executive Officer,
                                        Chief Product Architect and Chairman