Atty. Gideon Cionelo
Gideon’s practice focuses on litigation. Before joining Osborn Maledon, Gideon clerked for Judge Jennifer G.
Commercial Litigation Attorney · Serving Phoenix, AZ · 3+ Years Experience
Profile Summary
About Gideon Cionelo at a Glance
Gideon Cionelo is a business and litigation attorney based in Phoenix, Arizona, practicing at Osborn Maledon PA. They have 3+ years of legal experience, licensed to practice since 2023. Admitted to practice in Arizona (2023) and New Mexico (2024). Educated at Arizona State University (J.D., 2022). Recognitions include Best Lawyers in America — Commercial Litigation (2026). Serves clients in Phoenix, AZ and the surrounding metropolitan area.
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About Gideon Cionelo
- Gideon’s practice focuses on litigation
- Before joining Osborn Maledon, Gideon clerked for Judge Jennifer G. Zipps of the U.S
- District Court for the District of Arizona
- As a law clerk, he drafted civil orders and assisted in the administration of criminal and civil jury trials
- He also externed for Judge Daniel J. Kiley of the Maricopa County Superior Court and Judge Jennifer M. Perkins of the Arizona Court of Appeals
- His experience in trial and appellate courts provides him insight into how judges and juries decide legal and factual disputes
- He relies on this experience, and his prior work as a teacher and private investigator, when advocating for clients, explaining complex legal issues, uncovering facts in discovery, and preparing for trial
- Gideon graduated summa cum laude from the Sandra Day O’Connor College of Law at Arizona State University
- In law school, he was a teaching assistant, O’Connor Honors Fellow, Note and Comment Editor for the Arizona State Law Journal, and Center Scholar for ASU’s Center for Law, Science, and Innovation
- Outside the law, Gideon is involved in his community
- He runs a nonprofit that supports impoverished students in the Philippines and serves on the board of the Arizona Asian American Bar Association
Practice Areas Explained
Gideon Cionelo's Areas of Legal Practice
Each practice area below reflects the types of cases Gideon Cionelo handles, with a practical overview of what that area of law involves and how it may apply to your situation in Phoenix.
Business & Corporate Law in Phoenix
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
Gideon Cionelo is one of 497,491 business attorneys indexed nationally. Browse business attorneys in Arizona →
Civil Litigation in Phoenix
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Gideon Cionelo is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in Arizona →
Jurisdictional Context
Why Local Counsel Matters in Phoenix
Practicing law in Arizona. Legal matters in Arizona are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Phoenix are typically filed in the local municipal court or the appropriate Arizona state district court, depending on subject matter and amount in controversy. An attorney licensed in Arizona brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Arizona courts without local counsel or pro hac vice admission.
Phoenix Courts and Legal Process
Choosing a Phoenix-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Arizona attorneys? Browse all attorneys in Phoenix or all attorneys in Arizona.
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Professional Profile
Why Clients in Phoenix Choose Gideon Cionelo
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Gideon Cionelo's practice in the field of business and litigation.
3+ Years of Legal Practice
With 3 years in the profession, Gideon Cionelo has developed the procedural fluency and courtroom instincts that come from handling real cases under real deadlines.
Multi-State Bar Admission
Licensed in Arizona and New Mexico, Gideon Cionelo can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering business and litigation, Gideon Cionelo can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Phoenix
A Phoenix-based practice means Gideon Cionelo attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues Gideon Cionelo Handles in Phoenix
Below is a representative sample of the types of matters Gideon Cionelo has experience with under Arizona law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact Gideon Cionelo directly to discuss the specifics of your situation.
Search Reference
How People Find Gideon Cionelo Online
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Gideon Cionelo's Practice Areas & Specializations
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Awards & Professional Honors
Bar Admissions & Licensed Jurisdictions
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