Sigler & Nelson LLC – Estate, Probate, and Elder Law Attorneys – Lakewood, CO

(303) 444-3025

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Our Attorneys

 Protecting What Matters Most During Life’s Most Challenging Transitions

Sandra Sigler

Sandra Sigler is a shareholder of Sigler & Nelson LLC where her practice consists primarily of probate litigation, guardianship and conservatorship proceedings, bankruptcy law and matters arising from the financial exploitation of elders.

Sandra earned her law degree from Washburn University School of Law along with a Certificate in Business and Transactional Law. She served as an extern with the U.S. Bankruptcy Court in the District of Kansas before practicing in Topeka, Kansas. Sandra returned to Colorado in 2013 and is an active member of the American, Colorado, Kansas, Denver Bar Associations and the National Academy of Elder Law Attorneys (NAELA). Sandra began her legal career in Kansas working as a trial attorney in insurance defense and worker’s compensation cases. Her background also includes experience in venture capital financing and as a registered lobbyist for the insurance industry.

Sandra’s experience in elder law and probate litigation includes litigating contested guardianship and conservatorship proceedings for adults; will contests and fiduciary defense actions; representation of guardians, conservators and fiduciaries; trust administration and trust litigation along with estate planning and estate administration. 

Bar Admissions
  • Colorado State Courts, 2012
  • U.S. District Court, District of Colorado, 2013
  • Kansas State Courts, 2011
  • U.S. District Courts, District of Kansas, 2011
Professional Associations and Memberships
  • Colorado Bar Association
    • Elder Law Section
    • Trust & Estate Section
    • Civic & Community Affairs Committee, Chair, 2016-Present
    • Denver Bar Association
  • Colorado Guardianship Association
    • Board Member, President
  • National Academy of Elder Law Attorneys (NAELA)
  • Kansas Bar Association
  • American Bar Association
Education
  • Washburn University School of Law, JD, 2010
  • University of Nebraska at Omaha, BS, Business Administration, 1990
Community Service Activities
  • Jefferson County Senior Law Day and Planning Committee
  • Denver Senior Law Day and Planning Committee, Co-Chair
  • Jefferson County Probate Clinic Volunteer
  • Speaker for Colorado Courts Program
Publications
  • Colorado Senior Law Handbook, Chapter Author, “Mandatory Reporting of Elder Abuse or Exploitation”

Kayla Nelson

Kayla Nelson is a shareholder of Sigler & Nelson LLC. She represents clients in the areas of contested and uncontested guardianships and conservatorships, estate/probate administration and litigation, trust administration and litigation, fiduciary representation, elder law, and estate planning. Kayla also serves as guardian ad litem and court-appointed counsel in guardianship and conservatorship matters.
Kayla has worked with shareholder Sandra Sigler since 2018. Kayla began her legal career in the office of the 17th Judicial District Public Administrator, where she assisted with conservatorship and probate matters. Kayla is a member of the Elder Law Section, Trust & Estate Section, Spanish Speaking Lawyers Committee, and is the Co-Chair of the Elder Law Retreat Planning Committee of the Colorado Bar Association. She has also been a Board Member of Women’s Estate Planning Council.
Kayla has spoken to the public and the Colorado legislature on estate administration and estate planning topics. She is a member of the planning committees for Jefferson County Senior Law Day and Denver Senior Law Day, and volunteers at Senior Law Day events every year.
Kayla has been chosen as a Super Lawyers Rising Star!
Bar Admissions
Colorado State Courts, 2013
Professional Associations and Memberships
  • Colorado Bar Association
    • Elder Law Section
      • Secretary, 2014-2017
    • Trust & Estate Section
    • Spanish-Speaking Lawyers Committee
  • Women’s Estate Planning Council
    • Board Member, 2018-2024
Education
  • University of California – Davis, School of Law, JD, 2013
    • Recipient, Public Interest Law Certificate
  • New Mexico State University, BA, Government, 2010
    • Distinction in University Honors
Community Service Activities
  • Jefferson County Senior Law Day and Planning Committee
  • Denver Senior Law Day and Planning Committee
  • Denver Walk to End Alzheimer’s
  • Metro Volunteer Lawyers, Power of Attorney Workshop, 2015-2018
  • Rocky Mountain Children’s Law Center, 2014-2017
  • Denver Concert Band
    • Board Member, 2014-2017
Honors and Awards
  • Super Lawyers Rising Star, 2020 and 2023-2025

Spencer Crona

Spencer Crona is Of Counsel with Sigler & Nelson LLC. Spencer is a Denver native, a Fellow of the American College of Trust and Estate Counsel, and practices principally in the areas of probate, estate and trust litigation, conservatorships and guardianships, probate review of personal injury settlements and estate administration.
Over the past 30 years, Spencer has published numerous articles in professional journals and news media, ranging from probate litigation to a variety of public policy issues. Through Spencer’s extensive involvement in the Elder Law and Trust & Estate Sections of the Colorado Bar Association, he has participated in the drafting of Colorado probate statutes, including statutory provisions for the Colorado Uniform Guardianship and Protective Proceedings Act, estate compensation of professionals, and determinations of death in a mass-casualty incident.
Spencer has also served as Chair of both the Elder Law and the Trust & Estate Sections. For more than 20 consecutive years, he has taught as invited faculty at professional seminars within his fields of practice. For the 2022-2023 term, Spencer served as the Governor’s appointed commissioner to the Colorado Office of Public Guardianship.
Spencer received his B.A. in English from the University of Denver, his M.A. from the University of Missouri School of Journalism (amid a decade as a working newspaper journalist), and his J.D. from the University of Denver.
Spencer has been chosen as a Super Lawyer for more than 10 years.
Bar Admissions
  • Colorado State Courts, 1989
  • U.S. District Court, District of Colorado, 1989
  • U.S. Court of Appeals, Tenth Circuit, 1990
Professional Associations and Memberships
  • Colorado Bar Association
    • Trust & Estate Section
    • Elder Law Section
  • The American College of Trust and Estate Counsel (ACTEC), Fellow
Education
  • University of Denver, Sturm College of Law, JD, 1989
  • University of Missouri, MA
  • University of Denver, BA
Publications
  • “Anatomy of an Undue Influence Case” by Molly Callender, Spencer Crona and Richard Spiegle, 2013
  • “Will Preparation for Individuals Lacking Testamentary Capacity” by Spencer Crona, Martha Ridgway and Herbert Tucker, 2004
Honors and Awards
  • Super Lawyers, 2009-2010 and 2015-2025

Sophia Alvarez

Sophia Alvarez is an Associate Attorney with Sigler & Nelson LLC, where she represents clients in matters involving guardianships, conservatorships, estate and trust administration, probate litigation, and estate planning.
Sophia grew up in Texas, where she learned to advocate and volunteer alongside her parents with the League of United Latin American Citizens (LULAC). These experiences helped form her lifelong passion for advocating for underserved and vulnerable populations. Sophia spent many years in private practice, working in several areas of the law: family law, juvenile law, criminal law, Social Security Administration benefits, bankruptcy and consumer law, housing law, immigration law, employment law, estate planning and mediation.
Sophia began her focus in guardianship serving both as a public guardian and as legal counsel at the Nebraska Office of Public Guardian. She moved to Colorado in 2019 when she became the founding Executive Director of the Colorado Office of Public Guardianship (OPG). Sophia and the Colorado OPG team were successful in establishing OPG as a permanent agency in 2023.
Sophia is a frequent speaker on guardianship topics and legislation and is a Board Member of the Colorado Guardianship Association. She was recognized as the 2024 National Guardianship Association Member of the Year and was awarded the Center for Guardianship Certification’s Excellence Award in 2025.
Bar Admissions
  • Colorado State Courts, 2020
  • U.S. District Courts, District of Nebraska, 2010
  • Nebraska State Courts, 2008 (inactive)
Professional Associations and Memberships
  • Colorado Bar Association
    • Elder Law Section
    • Trust & Estate Section
  • Colorado Guardianship Association
    • Board Member, 2023-present
  • National Guardianship Association
    • National Certified Guardian
Education
  • University of Nebaraska – Lincoln, College of Law, JD, 2006
  • University of Nebraska – Lincoln, MS, Agronomy and Plant Sciences, 2001
  • Texas Women’s University, BS, Biology, 1998
Community Service Activities
  • Colorado Attorney Mentoring Program (CAMP), Mentor, 2023-present
  • Colorado Women’s Chamber of Commerce Mentorship Program, 2022-2023
  • Law School Yes We Can, Mentor, 2021-2024
  • Senior Law Day volunteer
Honors and Awards
  • Member of the Year, National Guardianship Association, 2024
  • Excellence Award, Center for Guardianship Certification, 2025

Sophia Boggs

Sophia Boggs is an Associate Attorney with Sigler & Nelson LLC, where she represents clients in matters involving estate and trust administration, probate litigation, estate planning, guardianships, and conservatorships. Sophia first joined Sigler & Nelson LLC as a law clerk during law school, gaining experience in complex probate and fiduciary issues and confirming her commitment to helping clients through some of life’s most difficult transitions.
In 2025, Sophia earned her J.D. from the University of Denver Sturm College of Law and was sworn in as a Colorado licensed attorney. Sophia holds a B.A. in Sociology with a minor in Political Science from Colgate University. At Colgate, she was a four-year member of the NCAA Division I women’s soccer team — a formative experience in discipline, teamwork, and perseverance.
Sophia is a member of the Elder Law and Trust & Estate Sections of the Colorado Bar Association and is a Notary Public. Originally from Germany and Philadelphia, Sophia now calls Denver home.
Bar Admissions
  • Colorado State Courts, 2025
Professional Associations and Memberships
  • Colorado Bar Association
    • Elder Law Section
    • Trust & Estate Section
Education
  • University of Denver, Sturm College of Law, JD, 2025
  • Colgate University, BA, Sociology, 2021