David Croyle Biography and Net Worth

Chief Medical Officer of Callan JMB


Before college, David Croyle entered the US Army as an enlisted soldier and served 3 1/2 years as a field medic and completed Airborne, Special Forces and Ranger school training. Dr. Croyle received his B.S. degree from Gannon University in Erie, PA in 1984. He returned to active duty where he completed his M.D. degree at the Uniformed University of the Health Sciences in Bethesda, MD in 1988. As an active duty officer, he completed his transitional internship in 1989 and diagnostic radiology residency in 1993, both at Brooke Army Medical Center in Ft. Sam Houston, TX. Dr Croyle later completed a body and musculo-skeletal imaging fellowship at the Naval Medical Center in San Diego, CA in 1996. His military experience included positions as a Radiology department chief, medical instructor for radiology residents, and as a general radiologist. Besides working on numerous quality assurance teams, he also underwent additional training in the medical effects of ionizing radiation and Combined Humanitarian Assistance Response Training.

Upon leaving the military, Dr. Croyle completed a fellowship in neuroradiology at Georgetown University in Washington, DC in 2002. Thereafter, he and his family moved to Cape Girardeau, MO where he worked as a radiologist until his retirement in 2019. Dr, Croyle has been the Medical Director for Callan JMB (Coldchain Technology Services) since its inception. He has participated in many facets of the business including the H1N1 pandemic response and more recently SARS COVID-19 pandemic response. Through experience, he has gained a knowledge of Cold Chain Management that few physicians possess.

What is David J. Croyle's net worth?

The estimated net worth of David J. Croyle is at least $1.82 million as of March 6th, 2026. Dr. Croyle owns 789,805 shares of Callan JMB stock worth more than $1,822,080 as of October 6th. This net worth estimate does not reflect any other assets that Dr. Croyle may own. Learn More about David J. Croyle's net worth.

How do I contact David J. Croyle?

The corporate mailing address for Dr. Croyle and other Callan JMB executives is 244 FLIGHTLINE DRIVE, SPRING BRANCH, TX, 78070. Callan JMB can also be reached via phone at (830) 438-0395 and via email at [email protected]. Learn More on David J. Croyle's contact information.

Has David J. Croyle been buying or selling shares of Callan JMB?

David J. Croyle has not been actively trading shares of Callan JMB in the last ninety days. Most recently, on Friday, March 6th, David J. Croyle bought 14,805 shares of Callan JMB stock. The stock was acquired at an average cost of $1.76 per share, with a total value of $26,056.80. Following the completion of the transaction, the insider now directly owns 789,805 shares of the company's stock, valued at $1,390,056.80. Learn More on David J. Croyle's trading history.

Are insiders buying or selling shares of Callan JMB?

In the last year, Callan JMB insiders bought shares 11 times. They purchased a total of 93,660 shares worth more than $147,648.77. The most recent insider tranaction occured on March, 6th when insider David J. Croyle bought 14,805 shares worth more than $26,056.80. Insiders at Callan JMB own 73.9% of the company. Learn More about insider trades at Callan JMB.

Information on this page was last updated on 3/6/2026.

David J. Croyle Insider Trading History at Callan JMB

Transaction DateBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
3/6/2026Buy14,805$1.76$26,056.80789,805View SEC Filing Icon  
2/5/2025Buy24,375$4.00$97,500.0024,375View SEC Filing Icon  
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David J. Croyle Buying and Selling Activity at Callan JMB

This chart shows David J. Croyle's buying and selling at Callan JMB by year and by quarter.

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Callan JMB Company Overview

Callan JMB logo
Callan JMB is a vertically integrated logistics and fulfillment company which provides thermal management logistics solutions to the life sciences industry through a combination of proprietary packaging, information technology and specialized cold chain logistics knowhow. We provide a system that utilizes advanced predictive technology to revolutionize the supply chain by guaranteeing the safety, effectiveness, and potency of every product handled to ensure product integrity, and to provide immediate response in time-sensitive industries while ensuring environmental responsibility. We view our solutions as disruptive to the “older technologies” of dry ice and liquid nitrogen, in that our solutions are comprehensive and combine our competencies in configurations that are customized to our client’s requirements. We provide comprehensive, reliable, and economic alternatives to all existing logistics solutions and services utilized for frozen shipping in the life sciences industry (e.g., personalized medicine, cell therapies, stem cells, cell lines, vaccines, diagnostic materials, semen, eggs, embryos, cord blood, organs, bio-pharmaceuticals, infectious substances, and other commodities that require continuous exposure to cryogenic or frozen temperatures). As part of our services, we provide the ability to monitor, record and archive crucial information for each shipment that can be used for scientific and regulatory purposes. Our Ship2Q® ultraviolet disinfection process (Safe Hygienic Irradiation Performance Process & Qualification) ensures fitness, thermal reliability, and cleanliness of the system components within the manufacturer specifications equal to new “off-the-shelf” shipper systems. Our systematic Ship2Q® process meets all good current manufacturing practices (“cGMP”) and good current distribution practices (“cGDP”) compliance standards and generates shipper specific track and trace documentation key to any deployment and reuse. Ship2Q® applies a system of control over the recovery and reuse phase of the logistics loop. We are able to recover and reuse the Greenbox shipper, amortizing its total cost across numerous shipments making it cost-neutral in the first few cycles. Additionally, our sophisticated cloud-based logistics operating platform, which is branded as our “Sentry” system, integrates GPS and precise temperature diagnostics throughout a package’s journey, maintaining the efficacy, safety, and quality of temperature-sensitive goods throughout transit—with zero bench time required. The Sentry system supports the management of the entire shipment and logistics process through a single interface, including initial order input, document preparation, customs clearance, courier management, shipment tracking, issue resolution, and delivery. In addition, it provides unique and incisive information dashboards and validation documentation for every shipment. The Sentry platform records and retains a fully documented “chain-of-custody” and, at the client’s option, “chain-of-condition” for every shipment, helping ensure that quality, safety, efficacy, and stability of shipped commodities are maintained throughout the process. This recorded and archived information allows our clients to meet exacting requirements necessary for scientific work and for proof of regulatory compliance during the logistics phase. With extensive experience in quality assurance and quality control, we deliver reliability by anticipating, responding, and overcoming the most complex situations with precision and compassion, providing peace of mind and a comprehensive solution for our customers. This empowers the healthcare and emergency response industries with solutions to ensure temperature-sensitive goods remain within specified parameters throughout transit through tracking mechanisms and predictive technology to ensure its integrity for patients, providers, and their communities. We were originally formed as Coldchain Technology Services, LLC, a Texas limited liability company. We reorganized as a holding company to Callan JMB Inc., a Nevada corporation, on February 14 2024. We are headquartered at 244 Flightline Dr., Spring Branch, TX 78070.
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Today's Range

Now: $2.33
Low: $2.26
High: $2.39

50 Day Range

MA: $2.13
Low: $1.28
High: $2.72

2 Week Range

Now: $2.33
Low: $0.65
High: $5.61

Volume

20,840 shs

Average Volume

1,987,583 shs

Market Capitalization

$13.21 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

N/A