UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

Resolute Energy Corporation
 (Name of Issuer)

COMMON STOCK, PAR VALUE $0.0001 PER SHARE
 (Title of Class of Securities)

76116A108
 (CUSIP Number)

Richard L. Covington
125 E. John Carpenter Fwy.
Suite 600
Irving, Texas 75062

 (Name, Address and Telephone Number of Person Authorized to
Receive Notices and Communications)

January 7, 2011
 (Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box [__].

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 
 
 
 
CUSIP No.
76116A108
 
1
NAMES OF REPORTING PERSONS:
 
KENNETH A. HERSH
 
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
 
(a)           £
(b)           £
3
SEC USE ONLY:
 
 
4
SOURCE OF FUNDS (SEE INSTRUCTIONS):
 
OO(1)
5
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
 
£
6
CITIZENSHIP OR PLACE OF ORGANIZATION:
 
UNITED STATES OF AMERICA
NUMBER OF
7
SOLE VOTING POWER:
 
0
SHARES
BENEFICIALLY
OWNED BY
8
SHARED VOTING POWER:
 
 14,899,357 (1)
EACH
REPORTING
PERSON
WITH
9
SOLE DISPOSITIVE POWER:
 
0
 
10
SHARED DISPOSITIVE POWER:
 
14,899,357 (1)
11
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
 
14,899,357
12
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
 
£
13
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
 
24.1%
14
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
 
IN
 
 
2
 
 
(1)
The Reporting Person is an Authorized Member of GFW VII, L.L.C., which is the sole general partner of G.F.W. Energy VII, L.P., which is the sole general partner of Natural Gas Partners VII, L.P.  Thus, the Reporting Person may be deemed to indirectly beneficially own all the Common Stock of the Issuer directly and/or indirectly deemed beneficially owned by Natural Gas Partners VII, L.P.

Natural Gas Partners VII, L.P. directly owns 6,276,166 shares of Common Stock of the Issuer and is deemed to indirectly beneficially own (i) 289,719 shares of Common Stock of the Issuer that are directly owned by NGP-VII Income Co-Investment Opportunities, L.P. by virtue of Natural Gas Partners VII, L.P.'s ownership of 100% of NGP Income Management, L.L.C., which is the sole general partner of NGP-VII Income Co-Investment Opportunities, L.P., and (ii) 8,333,472 shares of Common Stock of the Issuer deemed to be beneficially owned by Resolute Holdings, LLC by virtue of it and NGP-VII Income Co-Investment Opportunities, L.P.'s approximate 71% membership interest in Resolute Holdings, LLC, subject to certain adjustments in the future that could decrease such interest.

The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities for purposes of Section 16 or for any other purpose.
 
 
3
 
 
CUSIP No.
76116A108
 
1
NAMES OF REPORTING PERSONS:
 
NATURAL GAS PARTNERS VII, L.P.
 
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
 
(a)           £
(b)           £
3
SEC USE ONLY:
 
 
4
SOURCE OF FUNDS (SEE INSTRUCTIONS):
 
WC/OO(1)
5
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
 
£
6
CITIZENSHIP OR PLACE OF ORGANIZATION:
 
DELAWARE
NUMBER OF
7
SOLE VOTING POWER:
 
6,276,166
SHARES
BENEFICIALLY
OWNED BY
8
SHARED VOTING POWER:
 
 8,623,191 (1)
EACH
REPORTING
PERSON
WITH
9
SOLE DISPOSITIVE POWER:
 
6,276,166
 
10
SHARED DISPOSITIVE POWER:
 
8,623,191 (1)
11
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
 
14,899,357
12
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
 
£
13
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
 
24.1%
14
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
 
PN
 
 
4
 
 
(1)
NGP-VII Income Co-Investment Opportunities, L.P directly owns 289,719 shares of Common Stock of the Issuer.  The Reporting Person owns 100% of NGP Income Management, L.L.C., which is the sole general partner of NGP-VII Income Co-Investment Opportunities, L.P. Thus, the Reporting Person may be deemed to be the indirect beneficial owner of the Common Stock of the Issuer owned by NGP-VII Income Co-Investment Opportunities, L.P.

 Resolute Holdings, LLC, is deemed to directly beneficially own 8,333,472 shares of Common Stock of the Issuer for purposes of this Schedule 13D even though certain of the shares of Common Stock directly owned by Resolute Holdings, LLC are subject to the limitations set forth in this Schedule 13D.  The Reporting Person and NGP-VII Income Co-Investment Opportunities, L.P. have an approximately 71% membership interest in Resolute Holdings, LLC, subject to certain adjustments in the future that could decrease such interest.  Thus, the Reporting Person may be deemed to be the indirect beneficial owner of the Common Stock of the Issuer deemed beneficially owned by Resolute Holdings, LLC.

The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities for purposes of Section 16 or for any other purpose.
 
 
5
 

CUSIP No.
76116A108
 
1
NAMES OF REPORTING PERSONS:
 
RESOLUTE HOLDINGS, LLC
 
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
 
(a)           £
(b)           £
3
SEC USE ONLY:
 
 
4
SOURCE OF FUNDS (SEE INSTRUCTIONS):
 
OO(1)
5
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
 
£
6
CITIZENSHIP OR PLACE OF ORGANIZATION:
 
DELAWARE
NUMBER OF
7
SOLE VOTING POWER:
 
8,333,472 (1)
SHARES
BENEFICIALLY
OWNED BY
8
SHARED VOTING POWER:
 
0
EACH
REPORTING
PERSON
WITH
9
SOLE DISPOSITIVE POWER:
 
8,333,472 (1)
 
10
SHARED DISPOSITIVE POWER:
 
0
11
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
 
8,333,472
12
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
 
£
13
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
 
13.5%
14
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
 
OO – Limited Liability Company
 
 
6
 
 
(1)
The Reporting Person directly owns 1,400,139 shares of Common Stock issued in the acquisition (the "Acquisition") completed pursuant to that certain Purchase and IPO Reorganization Agreement (the "Purchase Agreement"), dated as of August 2, 2009, as amended, among Resolute Energy Corporation, Hicks Acquisition Company I, Inc., Resolute Holdings, LLC and others and registered in the Issuer's Form S-4 Registration Statement (333-161076).  Forfeiture provisions with respect to 1,400,039 of the shares lapsed on February 2, 2011.

The Reporting Person also directly owns 2,333,333 warrants (the "Sponsor Warrants") acquired in connection with the Acquisition. E ach Sponsor Warrant entitles the holder to purchase one share of Common Stock at a price of $13.00 per share commencing on the date of the closing of the Acquisition and ending five years from the Acquisition Closing Date.

The Reporting Person also directly owns 4,600,000 warrants (the "Founders' Warrants") issued in the Acquisition. Each Founders' Warrant entitles the holder to purchase one share of Common Stock at a price of $13.00 per share.  The warrant exercise period of the Founders' Warrants commenced on January 7, 2011 and ends on September 25, 2014.

Thus, for purposes of this Schedule 13D, the Reporting Person is deemed to directly beneficially own 8,333,472 shares of Common Stock.
 
 
7
 

TABLE OF CONTENTS

Item 1. Security and Issuer.
 
   
Item 2. Identity and Background.
  
   
Item 3. Source and Amount of Funds or Other Consideration.
  
   
Item 4. Purpose of Transaction.
  
   
Item 5. Interest in Securities of the Issuer.
  
   
Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.
  
   
Item 7. Material to be filed as Exhibits.
  
   
SIGNATURES
  
   
Exhibit Index
  
 
 
8
 

This Amendment No. 1 to Schedule 13D amends the joint Schedule 13D filed on February 17, 2010 by Kenneth A. Hersh, Natural Gas Partners VII, L.P. and Resolute Holdings, LLC (the "Original Schedule 13D").  The purpose of this Amendment is to reflect the reporting persons' beneficial ownership of the Founders' Warrants that became exercisable on January 7, 2011.

Except as provided herein, this Amendment does not modify any of the information previously reported in the Original Schedule 13D. Capitalized terms used herein but not defined have the meanings ascribed to them in the Original Schedule 13D.

Item 1. Security and Issuer.

No modification is made to Item 1 of the Original Schedule 13D.

Item 2. Identity and Background.

No modification is made to Item 2 of the Original Schedule 13D.

Item 3. Source and Amount of Funds or Other Consideration.

No modification is made to Item 3 of the Original Schedule 13D.

Item 4. Purpose of Transaction.

No modification is made to Item 4 of the Original Schedule 13D.

Item 5. Interest in Securities of the Issuer.

The information in Item 5 of the Original Schedule 13D is hereby amended in its entirety to read as follows:

The percent of class provided for each Reporting Person is based on the Issuer having 54,861,239 total outstanding shares of Common Stock as of November 12, 2010, as reported on the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 12, 2010, and assumes the conversion of 2,333,333 Sponsor Warrants (as defined below) and 4,600,000 Founders' Warrants (as defined below) convertible into Common Stock for a total of 61,794,572 shares.

(a)-(b)   (i)
Kenneth A. Hersh does not directly own any Common Stock. Kenneth A. Hersh is an Authorized Member of GFW VII, L.L.C., the general partner of G.F.W. Energy VII, L.P., which is the general partner of NGP VII, and thus may be deemed to possess shared voting and dispositive powers with respect to all shares of Common Stock that NGP VII is the sole record owner of (6,276,166 shares (10.2%)), as well as all shares of Common Stock that NGP VII may be deemed to beneficially own (289,719 shares (0.5%) directly owned by NGP VII Co-Investment Opportunities, L.P. and 8,333,472 shares (13.5%) deemed beneficially owned by Resolute Holdings). Therefore, Kenneth A. Hersh may be deemed to possess shared voting and dispositive powers with respect to 14,899,357 shares (24.1%) of Common Stock.

 
(ii)
NGP VII is the sole record owner of, and has the sole power to vote and dispose of 6,276,166 shares (10.2%) of Common Stock.

NGP VII owns 100% of NGP Income Management, L.L.C which serves as the general partner of NGP-VII Income Co-Investment. NGP VII may thus be deemed to possess shared voting and dispositive powers with respect to all of the shares of Common Stock owned directly by NGP-VII Income Co-Investment (289,719 shares (0.5%)).

NGP VII and NGP-VII Income Co-Investment Opportunities, L.P. have an approximately 71% membership interest in Resolute Holdings subject to certain adjustments in the future that could decrease such interest.  Thus, NGP VII may be deemed to possess shared voting and dispositive powers with respect to all of the shares of Common Stock deemed beneficially owned by Resolute Holdings (8,333,472 shares (13.5%)).

Therefore, NGP VII may be deemed to possess sole and shared voting and dispositive powers with respect to 14,899,357 shares (24.1%) of Common Stock.
 
 
9
 
 
 
(iii)
Resolute Holdings is the sole record owner of, and has the sole power to vote and dispose of 1,400,139 shares (2.3%) of Common Stock.  Forfeiture provisions with respect to 1,400,039 of the shares lapsed on February 2, 2011.

Resolute Holdings also directly owns 2,333,333 warrants (the "Sponsor Warrants") acquired in connection with the Acquisition.  Each Sponsor Warrant entitles the holder to purchase one share of Common Stock at a price of $13.00 per share commencing on the date of the closing of the Acquisition and ending five years from the Acquisition Closing Date.

Resolute Holdings also directly owns 4,600,000 warrants (the "Founders' Warrants") issued in the Acquisition. Each Founders' Warrant entitles the holder to purchase one share of Common Stock at a price of $13.00 per share.  The warrant exercise period of the Founders' Warrants commenced on January 7, 2011 and ends on September 25, 2014.

Thus, for purposes of this Schedule 13D, Resolute Holdings is deemed to directly beneficially own 8,333,472 shares (13.5%) of Common Stock.

The above Reporting Persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interests therein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of the reported securities for purposes of Section 16 or for any other purpose.

(c)
There have been no reportable transactions with respect to the Common Stock within the last 60 days by the Reporting Persons.

(d)
No person other than the Reporting Persons or the managers of Resolute Holdings indentified on Schedule A of the Original Schedule 13D, has the right to receive or the power to direct the receipt of distributions from, or the proceeds from the sale of, the Common Stock being reported on this Schedule 13D.

(e)
Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

No modification is made to Item 6 of the Original Schedule 13D.

Item 7. Material to be Filed as Exhibits.

Exhibit A
Joint Filing Agreement dated February 17, 2010  (incorporated by reference to Exhibit A to the Schedule 13D filed on February 17, 2010)

 
10
 

SIGNATURES

After reasonable inquiry and to the best of each of the undersigned's knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: February 23, 2011
 
/s/ Kenneth A. Hersh
Kenneth A. Hersh
 
NATURAL GAS PARTNERS VII, L.P.
   
By:
G.F.W. Energy VII, L.P., its general partner,
   
By:
GFW VII, L.L.C., its general partner,
   
By:
/s/ Kenneth A. Hersh
 
Kenneth A. Hersh
 
Authorized Member
   
RESOLUTE HOLDINGS, LLC
   
By:
/s/ James M. Piccone
 
James M. Piccone, President
 
 
11
 

Exhibit Index

Exhibit A
Joint Filing Agreement dated February 17, 2010 (incorporated by reference to Exhibit A to the Schedule 13D filed on February 17, 2010)
 
 
12