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About Colin
Biography
Colin D. O’Sullivan is an Arizona native with deep roots in the legal community. He earned his Bachelor of Business Administration Degree in Business Administration and Marketing from the University of San Diego where he graduated Cum Laude. Following his undergraduate education, Mr. O’Sullivan received his Juris Doctor from the University of Arizona, James E. Rogers College of Law. While in law school, Colin took advantage of the February Bar Examination and took the bar exam early during his third year of law school. Mr. O’Sullivan graduated law school having already passed the bar exam which allowed him to begin practicing law immediately.
Mr. O’Sullivan worked for the Maricopa County Public Defender’s office for four years. Mr. O’Sullivan has extensive criminal defense experience having represented clients in thousands of felony matters and has handled all types of cases ranging from homicides to misdemeanors. He has extensive experience handling trials, evidentiary hearings, plea negotiations, oral arguments, and jury selection; conducting discovery analysis, legal research, investigation, and witness interviews; and writing motions and other legal pleadings.
As a trial attorney, Mr. O’Sullivan has tried felony jury trials ranging from 2nd Degree Murder and Sex Conduct With a Minor down to Robbery and Possession of Marijuana. He has received numerous favorable jury trial verdicts including obtaining not guilty verdicts on Aggravated Assault with a Deadly Weapon on Police Officers, Possession of Meth for Sale, Aggravated Assault with a Deadly Weapon, Molestation of a Child, Aggravated Assault, Kidnapping, Theft of Means of Transportation, Unlawful Use of Means of Tranportation, Burglary, Robbery and Possession of Marijuana. Mr. O’Sullivan’s oral advocacy and courtroom experience allows him to persuasively and passionately represent his clients.
Colin D. O’Sullivan is a member of the Arizona State Bar and is licensed to practice law in Arizona and the United States District Court of Arizona.
Practice Areas
5
Practice Areas
Drug Crime
25%
Sex Crime
25%
Violent Crime
25%
Criminal Defense
20%
Fees and Rates
Cost
Payment Methods
- Cash
- Check
- Credit Card
Awards
2022 2021
Licenses
Licensed in Arizona for 11 years
State: Arizona
Acquired: 2015
No misconduct found
Location
Colin O'Sullivan
2929 E. Camelback Rd., Ste. 224, Phoenix, AZ, 85016
Gallery
Colin Daniel O'Sullivan's Reviews
Avvo Review Score
35 Client Reviews
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Practice Areas
Showing 31 - 35 of 35 reviews
Posted by CURT | May 19, 2021 | Hired Attorney
HIRE THIS ATTORNEY
I would highly recommend Colin, he helped me with my case, he's professional and knows the law very well.
Posted by anonymous | May 19, 2021 | Hired Attorney
Life Changing Lawfirm
I'm Honered and Privilege to inform you that Colin Osullivan & Suzuki lawfirm are the Best in the Valley with great experience & Very Reasonable and affordable I was looking at some time and with the help of this lawfirm & Fought hard for Me & always kept me in the loop of things walked out with Prob...
Posted by Clara v | May 11, 2022 | Hired Attorney
Absolutely amazing!
The overall experience working with Colin was with great ease any questions I had he answered to the best of his capabilities. He used all of his resources to get the best deal for my fiancé. It was a pleasure having him.
Posted by Michael | June 16, 2026 | Hired Attorney
Will cover up for illegal law enforcement activities
My experience with Colin O’Sullivan was extremely disappointing. I was an active Army Reservist when I was assaulted in the 4th Avenue jail garage, an area that I understood had extensive surveillance. This happened shortly before my ACL reconstruction. The officers were aware of my knee injury. T...
Posted by VV | June 06, 2024
The Best OUT Standing LAWYER/Attorney
My Attorney Colin Daniel O'Sullivan was always on time.! He returned my many, numerous phone calls. I'm glad I had the opportunity to be Represented by an OUT standing Public Pretend ore'.! Assisted me in coping with time I spend in jail, although I was innocent.! Anyone knows how many double ...
Colin Daniel O'Sullivan's Lawyer Endorsements
"Danny and I worked together at our previous firm. I observed Danny fight for his clients and not back down from prosecutors. He isn't afraid to advocate for his client in the courtroom and always has their best interests in mind. He can articulate the strengths and weaknesses of your case and won't sugar coat his advice. I endorse Danny for anyone looking for a criminal defense attorney that knows what they're doing!"
"Danny and I worked together for several years. Danny is a skilled and intelligent lawyer that truly cares about his clients. During my time working with Danny I was able to see first-hand his dedication to his cases and clients. I would highly recommend Danny to anyone looking to hire an attorney."
"Mr. O'Sullivan is a brilliant trial attorney. His knowledge of the law and compassion for clients is evident every time he steps in a courtroom. I fully endorse Mr. O'Sullivan."
Shifa Alkhatib
Employment and labor lawyer
Samantha Knobbe
Criminal defense lawyer
Alexis Brooks
Criminal defense lawyer
Experience
Honors
2022
Litigator Of The Year, American Institute of Trial Lawyers
2022
Client's Choice, Avvo
2021
Client's Choice, Avvo
2021
Top 40 Under 40, National Trial Lawyers Association
Work Experience
2021 - Present
Supervising Attorney, Suzuki Law Offices
2019 - 2021
Attorney, Suzuki Law Offices
2015 - 2019
Trial Attorney, Maricopa County Public Defender's Office
Associations
2022 - Present
American Institute of Trial LawyersMember
2021 - Present
National Trial Lawyers AssociationMember
2015 - Present
State Bar of ArizonaMember
Sample of Legal Cases
State vs. Pargo CR2017-006441
Dismissed with Prejudice during trial
State vs. Yu CR202001025
Not Guilty
State vs. Spinka CR2017-116084-001
Not Guilty
State vs. Herold CR2016-005294
Not Guilty
State vs. Wade CR2017-100895
Not Guilty
State vs. Smith CR2016-001384-001
Not Guilty
State vs. Maldonado CR2016-002708-003
Not Guilty
Education
2015
U of Arizona
JD - Juris Doctor
2011
University of San Diego
BBA - Bachelor of Business Administration
Speaking Engagements
2018
Maricopa County Public Defender's Office New Attorney Training
Advanced Trial Skills
2017
Maricopa County Public Defender's Office New Attorney Training
Trial Skills
Languages
English
Activity
Legal Answers