MOMKUS LLP | LISLE, IL
  • Firm Overview
  • Practice Areas
    • Appellate Law
    • Business Litigation
    • Civil Litigation
    • Commercial Insolvency and Bankruptcy
    • Commercial Real Estate
    • Employment Advisory Services
    • Employment Litigation
    • Family Law & Divorce
    • Business Services
    • Mergers & Acquisitions
    • Estate Planning
    • Trust & Estate Administration
    • Trust & Estate Litigation
  • Attorneys
    • Jennifer L. Friedland
    • John P. Killacky
    • Bret R. Klemetson
    • Edward J. Momkus
    • Patrick R. Boland
    • Michele E. Boveri
    • Robert R. Bruce
    • Carrie M. Buddingh
    • William J. Costello
    • Desmond P. Curran
    • Jason A. Doran
    • Joseph R. Fortunato Jr.
    • Heather L. Genck
    • Neil T. Goltermann
    • Ann C. Matthews
    • David A. Newby
    • Ronald A. Nyberg
    • Lauryn E. Parks
    • William J. Scott, Jr.
    • Savannah B. Slamans
    • Martin D. Tasch
    • William S. Thayer
    • Mollie H. Thompson
  • Contact
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WILLIAM J. COSTELLO
Associate


​​Phone:   (630) 434-0400 Ext. 121
Direct Line:   (630) 668-4217
Fax:   (630) 434-0444​
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​​​AREAS OF PRACTICE
​​Commercial and Civil Litigation
Commercial Insolvency and Bankruptcy

Banking and Financial
Criminal Defense
Family Law


​After receiving a B.A. in Criminal Justice from the University of Dayton in 2002, William J. Costello graduated from the University of Dayton School of Law in 2007. While in law school, he was a law clerk for Judge Mary Kate Huffman and Judge Patrick McGann when he drafted numerous summary judgment opinions for the Court. During his final year of law school, Bill was a law clerk for Martin, Folino, Stachler, & Harmon where he drafted complaints, motions supporting and opposing summary judgment, and an appellate brief which resulted in the affirmance of the lower court’s grant of summary judgment.

After becoming a lawyer, Bill was a prosecutor for many years at the DuPage County State’s Attorney’s Office in Wheaton. During his tenure there, he tried more than 170 misdemeanor/felony bench and jury trials to verdict and argued hundreds of motions. Bill was also involved in the investigation and charging of serious felonies ranging from sexual assault, kidnapping, robbery and reckless homicide to first degree murder.
Education
​University of Dayton School of Law, Dayton, Ohio, 2007
  • J.D.
University of Dayton, Dayton, Ohio, 2002
  • B.A., Criminal Justice
past employment
  • University of Dayton School of Law, Law Clerk
  • Martin, Folino, Stachler, & Harmon, Law Clerk
  • DuPage County State’s Attorney’s Office, Prosecutor
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1001 Warrenville Road, Suite 500                                                       235 Montgomery Street, Suite 704
Lisle, IL 60532                                                                                         San Francisco, CA 94104
Phone: (630) 434-0400                                                                         Phone:
(415) 496-4866
Fax: (630) 434-0444

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© 2021 Momkus LLP
​Designed by Buddingh & Associates​​
  • Firm Overview
  • Practice Areas
    • Appellate Law
    • Business Litigation
    • Civil Litigation
    • Commercial Insolvency and Bankruptcy
    • Commercial Real Estate
    • Employment Advisory Services
    • Employment Litigation
    • Family Law & Divorce
    • Business Services
    • Mergers & Acquisitions
    • Estate Planning
    • Trust & Estate Administration
    • Trust & Estate Litigation
  • Attorneys
    • Jennifer L. Friedland
    • John P. Killacky
    • Bret R. Klemetson
    • Edward J. Momkus
    • Patrick R. Boland
    • Michele E. Boveri
    • Robert R. Bruce
    • Carrie M. Buddingh
    • William J. Costello
    • Desmond P. Curran
    • Jason A. Doran
    • Joseph R. Fortunato Jr.
    • Heather L. Genck
    • Neil T. Goltermann
    • Ann C. Matthews
    • David A. Newby
    • Ronald A. Nyberg
    • Lauryn E. Parks
    • William J. Scott, Jr.
    • Savannah B. Slamans
    • Martin D. Tasch
    • William S. Thayer
    • Mollie H. Thompson
  • Contact