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Nathaniel Lee Prosser III

Securities and investment fraud Attorney at Memphis, TN

5.0   4 reviews

also known as Niel Prosser

  • Licensed for 39 years
    State TN
    Acquired 1985
    Active No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Nathaniel

Learn Nathaniel’s areas of practice.

Niel Prosser has over 35 years of experience in securities arbitration and commercial litigation. In that span, he has seen the law from several perspectives, including as a partner in a large law firm and as Head of Litigation for a large securities firm.

Niel graduated from the University of Memphis School of Law with honors in 1985. For the next year he clerked for the Chief Judge of the U.S. District Court for the Western District of Tennessee. Niel then went into private practice at the second largest firm in Memphis, Armstrong Allen, where for 13 years he handled various types of business litigation in Tennessee, Arkansas and Mississippi (including non-competition/confidentiality agreements, contracts, corporate disputes, products liability and securities), as well as some business practice.

In 1999, Niel was hired as Deputy General Counsel and Head of Litigation for Morgan Keegan and Company, a position he held for 15 years. Morgan Keegan, which was acquired by Raymond James in 2012, was a large regional broker-dealer with revenues exceeding $1 billion and offices throughout the southeastern United States, parts of the Midwest, New York and California. Niel’s position at Morgan Keegan gave him a wealth of securities arbitration experience. In addition to handling numerous cases personally, Niel directed the defense of approximately 1,750 arbitration cases, including many cases filed beginning in 2007 regarding Morgan Keegan’s proprietary “RMK High-Yield Bond Funds”. These Funds, which had previously been top performers, crashed at the outset of the Financial Crisis, generating arbitrations, state/federal lawsuits and class actions collectively seeking billions of dollars in damages. In 2012, Niel and his legal team at Morgan Keegan were recognized as “In-House Team of the Year” at the Benchmark Litigation Annual Awards South. Niel left Raymond James and started the Prosser Law Firm in 2014. In 2022, he added two Partners – Rob Clapper and Kyle Johnson – and renamed the firm Prosser, Clapper & Johnson, PLC.

Niel’s wealth of experience includes many other broker/dealer issues, including regulatory investigations, broker recruiting, promissory note collection, employment issues, U-4/U-5 reporting/expungement and firm supervisory and compliance procedures.

Niel has taught Legal Research and Writing as an adjunct professor at The University of Memphis School of Law, served as President of the Memphis Mid-South Chapter of the Federal Bar Association, earned the designation Certified Regulatory and Compliance Professional through the NASD’s certification program at the Wharton School of Business and has held the Series 7 and Series 24 securities licenses. He is licensed to practice law in Tennessee and is a member of the Memphis and Tennessee Bar Associations.


Prosser, Clapper & Johnson PLC
5865 Ridgeway Center Parkway
Memphis, TN, 38120


5.0 / 5.0
  4 customer reviews
5 Star
4 Star
3 Star
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1 Star
Posted by Matt | May 8, 2023
This review is from a person who hired this attorney.
| Hired Attorney
The Best, Hands Down
I hired Niel and his team to represent me for expungement of a baseless claim on my advisor record. Kyle Johnson was my main attorney, and he did an absolutely fantastic job! Thorough, diligent, persistent -- with great knowledge of the most optimal steps to take for expungement. Got it done swiftly, too. I was blessed to get to know, Kyle, Niel, Rob and Alex, and would highly recommend their team for anyone else needing their expertise and services!
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Posted by Jamie | May 2, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Expert in Securities Litigation
Niel represented us in a FINRA arbitration to pursue our securities claims against one of the largest financial firms in the world. The claims made in the case were for unauthorized trading, breach of fiduciary duty, breach of contract, negligence, elder exploitation, fraud, unsuitability, failure to supervise and violation of state securities laws. After a five-year fight involving the production of almost 300,000 pages of documents, numerous depositions and many pre-trial motions, briefs and hearings in front of the arbitration panel, the case was settled after two weeks of arbitration (with an anticipated four or five more weeks of arbitration remaining) for an amount well in excess of $6,000,000. Niel’s vast knowledge of securities law coupled with his past industry experience as general counsel for a large securities firm made Niel uniquely qualified to represent us in this complex litigation. He is a talented and experienced litigator with the tenacity to zealously pursue the claims of his client to a final resolution while always conducting himself in a professional manner. I would recommend Niel and his partners, Rob and Kyle, to anyone pursuing a claim involving securities and investment fraud without hesitation.
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Posted by Ron | April 25, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Absolutely Fantastic
I hired Niel and his associates to represent me in a FINRA arbitration against an $8 trillion dollar investment firm that accused me of breaking my non-solicit agreement after I was terminated. After a year and a half of preparation, we entered into a 3 week arbitration last summer. The panel found no wrongdoing on my part and denied all claims in there entirety. Niel and Kyle Johnson (his partner) are incredibly knowledgeable, professional, and detail oriented in their approach. It became clear to me on day one of the arbitration that the Plaintiffs hired attorneys (who bring dozens and dozens of these type of cases against former employees on behalf of this $8 trillion dollar broker-dealer) were no match for Niel and Kyle. I HIGHLY recommend them to anyone who is considering a case or is need of representation for something they are being falsely accused of.
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Posted by Mike and Nita | April 21, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Great representation and great result.
Neil and his team worked tirelessly for months to help us get our financial life back on track. Without going into detail about our case and the resulting award, I can say that Neil took a case that other attorneys viewed as having little chance of substantial recovery and returned a result that exceeded our hopes. Our case took over a year to resolve and during that time Neil and his team ( Kyle and Rob) kept us informed and involved us in every phase of the exhausting process. We needed a lot of hand holding and explanation and they delivered both with grace and patience. We were blessed when we were guided to Neil. I trust him and I would recommend him to anyone needing his expertise and services.
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  • Free Consultation 60 minutes
Payment methods
Cash, Check


AVVO RATING 7.7 (Very Good)

Work Experience

  • Partner
  • The Prosser Law Firm
  • 2014 - Present
  • Deputy General Counsel / Head of Litigation -Morgan Keegan
  • Raymond James Financial, Inc.
  • 2012 - 2014
  • Deputy General Counsel / Head of Litigation
  • Morgan Keegan & Company
  • 1999 - 2012
  • Partner
  • Armstrong Allen, PLLC
  • 1986 - 1999
  • Federal Law Clerk
  • U.S. District Court, W.D. Tn
  • 1985 - 1986
View all work experience


  • University of Memphis - Cecil C. Humphreys School of Law
  • JD - Juris Doctor
  • 1985
  • Christian Brothers University
  • BA - Bachelor of Arts
  • 1982

Sample of Legal Cases

  • $6.8 Million Recovery Against Morgan Stanley & Frank Venable
  • $6.8 Million Settlement
  • $1,488,753 Recovery Against First Allied Securities & Larry Boggs
  • $1,488,753


  • Tennessee Bar Association
  • Member
  • 2010 - Present
  • Memphis Bar Association
  • Business Law Section Board of Directors
  • 2010 - 2010
  • Federal Bar Association -Memphis Midsouth Chapter
  • President
  • 1995 - 1996

Languages Spoken

  • English

Honors and Awards

  • In-House Team of the Year, South
  • Benchmark Litigation
  • 2011

Speaking Engagements

  • PIABA -Public Investors Arbitration Bar Assoc. -Annual Meeting
  • Settlement of Securities Arbitration Cases
  • 2014
  • Memphis Bar Assoc. -Spotting Red Flags When Viewing A Client's Brokerage Account
  • Spotting Red Flags When Viewing A Client's Brokerage Account
  • 2014
  • University of Memphis Law School - First Year Law Students
  • Adjunct Professor - Legal Research and Writting
  • 1989

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Memphis Securities and investment fraud Lawyer Nathaniel Lee Prosser III
Nathaniel Lee Prosser III
Securities and investment fraud Attorney
Memphis, TN
Licensed for 39 years
Free Consultation