Winter Course Of Infectious Diseases

Denver, CO
Tax-exempt since Nov. 2005
EIN: 20-1285673

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Type of Nonprofit

Designated as a 501(c)(3) Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Category: Educational Institutions and Related Activities / Adult, Continuing Education (NTEE)

Donations to this organization are tax deductible.

Revenue

$221k (2024)

Expenses

$167k (2024)

Total Assets

$213k (2024)

Total Liabilities

$0 (2024)

Source: Form 990 tax filings from 2011 to 2024

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. If this organization filed an amended return, it may not be reflected below. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Form 990 data is from the IRS.

Fiscal Year Ending Dec.
2024

Revenue

$220,604

Expenses

$166,728

Net Income

$53,876

Net Assets

$213,486

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$69,930	31.7%
Interest Revenue	$904	0.4%
Dividends	$0
Sales of Assets	$0
Other Income	$149,770	67.9%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$0
Compensation of Officers*	$5,750	3.4%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$213,486
Total Liabilities	$0
Net Assets	$213,486

Compensation

Key Employees and Officers	Compensation	Other
Daniel Diekema (President)	$2,000	$0
Paul Auwaerter (Director)	$2,000	$0
Debra A Goff (Director)	$1,000	$0
Carl Le Buhn (Director)	$750	$0
Helen Boucher (Director)	$0	$0
Aw Karchmer (Secretary/Treas)	$0	$0
Barbara Murray (Director)	$0	$0
Richard Wenzel (Director)	$0	$0
Carlos Del Rio (Director)	$0	$0
Kimberly E Hanson (Director)	$0	$0

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990-PF

Filed on Nov. 5, 2025

Primary tax return for a private foundation's activities, finances, and governance

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XML

Fiscal Year Ending Dec.
2023

Revenue

$217,721

Expenses

$228,708

Net Income

-$10,987

Net Assets

$159,610

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$94,499	43.4%
Interest Revenue	$1,978	0.9%
Dividends	$0
Sales of Assets	$0
Other Income	$121,244	55.7%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$1,530	0.7%
Compensation of Officers*	$6,750	3.0%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$159,610
Total Liabilities	$0
Net Assets	$159,610

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (Director)	$1,500	$0
Paul Auwaerter (Director)	$1,500	$0
Debra A Goff (Director)	$1,500	$0
Kimberly E Hanson (Director)	$1,500	$0
Carl Le Buhn (Director)	$750	$0
Helen Boucher (Director)	$0	$0
Aw Karchmer (Secretary/Treas)	$0	$0
Barbara Murray (Director)	$0	$0
Daniel Diekema (President)	$0	$0
Carlos Del Rio (Director)	$0	$0

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990-PF

Filed on Oct. 29, 2024

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2022

Revenue

$218,122

Expenses

$201,785

Net Income

$16,337

Net Assets

$170,597

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$104,485	47.9%
Interest Revenue	$293	0.1%
Dividends	$0
Sales of Assets	$0
Other Income	$113,344	52.0%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$6,154	3.0%
Compensation of Officers*	$4,500	2.2%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$170,597
Total Liabilities	$0
Net Assets	$170,597

Compensation

Key Employees and Officers	Compensation	Other
Paul Auwaerter (Director)	$1,500	$0
Debra A Goff (Director)	$1,500	$0
Carl Le Buhn (Director)	$750	$0
Kimberly E Hanson (Director)	$750	$0
Helen Boucher (Director)	$0	$0
Aw Karchmer (Secretary/Treas)	$0	$0
Barbara Murray (Director)	$0	$0
Richard Wenzel (Director)	$0	$0
Daniel Diekema (President)	$0	$0
Carlos Del Rio (Director)	$0	$0

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990-PF

Filed on Nov. 6, 2023

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2021

Revenue

$64,049

Expenses

$81,894

Net Income

-$17,845

Net Assets

$154,260

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$42,500	66.4%
Interest Revenue	$16	0.0%
Dividends	$0
Sales of Assets	$0
Other Income	$21,533	33.6%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$0
Compensation of Officers*	$3,250	4.0%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$154,260
Total Liabilities	$0
Net Assets	$154,260

Compensation

Key Employees and Officers	Compensation	Other
Aw Karchmer (Secretary/Treas)	$1,000	$0
Kimberly E Hanson (Director)	$1,000	$0
Carl Le Buhn (Director)	$750	$0
Debra A Goff (Director)	$500	$0
Helen Boucher (Director)	$0	$0
Barbara Murray (Director)	$0	$0
Richard Wenzel (Director)	$0	$0
Daniel Diekema (President)	$0	$0
Paul Auwaerter (Director)	$0	$0
Carlos Del Rio (Director)	$0	$0

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990-PF

Filed on Nov. 15, 2022

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2020

Revenue

$250,022

Expenses

$176,369

Net Income

$73,653

Net Assets

$172,104

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$84,000	33.6%
Interest Revenue	$1,720	0.7%
Dividends	$0
Sales of Assets	$0
Other Income	$164,302	65.7%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$22,500	12.8%
Compensation of Officers*	$7,500	4.3%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$172,105
Total Liabilities	$1
Net Assets	$172,104

Compensation

Key Employees and Officers	Compensation	Other
Aw Karchmer (Secretary/Treas)	$1,500	$0
Paul Auwaerter (Director)	$1,500	$0
Carlos Del Rio (Director)	$1,500	$0
Debra A Goff (Director)	$1,500	$0
Kimberly E Hanson (Director)	$1,500	$0
Helen Boucher (Director)	$0	$0
Carl Le Buhn (Director)	$0	$0
Barbara Murray (Director)	$0	$0
Richard Wenzel (Director)	$0	$0
Daniel Diekema (President)	$0	$0

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990-PF

Filed on Nov. 15, 2021

Primary tax return for a private foundation's activities, finances, and governance

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PDF XML

Fiscal Year Ending Dec.
2019

Revenue

$234,681

Expenses

$220,776

Net Income

$13,905

Net Assets

$98,451

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$185,500	79.0%
Interest Revenue	$843	0.4%
Dividends	$0
Sales of Assets	$0
Other Income	$48,338	20.6%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$13,500	6.1%
Compensation of Officers*	$6,000	2.7%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$98,452
Total Liabilities	$1
Net Assets	$98,451

Compensation

Key Employees and Officers	Compensation	Other
Aw Karchmer (Treasurer)	$1,500	$0
Richard Wenzel (Director)	$1,500	$0
Daniel Diekema (Vice President)	$1,500	$0
Jose Montoya (Director)	$1,500	$0
Helen Boucher (President)	$0	$0
Carl Le Buhn (Director)	$0	$0
Barbara Murray (Director)	$0	$0

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990-PF

Filed on Nov. 16, 2020

Primary tax return for a private foundation's activities, finances, and governance

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Schedules ▼

XML

Fiscal Year Ending Dec.
2018

Revenue

$32,500

Expenses

$115,295

Net Income

-$82,795

Net Assets

$84,547

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$32,500	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$36,000	31.2%
Compensation of Officers*	$9,000	7.8%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$84,547
Total Liabilities	$0
Net Assets	$84,547

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Secretary & Treasurer)	$3,000	$0
Jose Montoya (Director)	$1,500	$0
Daniel Diekema (Director)	$1,500	$0
Helen Boucher (Director)	$0	$0

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990-PF

Filed on Nov. 12, 2019

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2017

Revenue

$216,587

Expenses

$196,305

Net Income

$20,282

Net Assets

$167,342

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$216,587	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$39,000	19.9%
Compensation of Officers*	$8,500	4.3%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$167,342
Total Liabilities	$0
Net Assets	$167,342

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Secretary & Treasurer)	$3,000	$0
Jose Montoya (Director)	$1,500	$0
Daniel Diekema (Director)	$1,000	$0
Helen Boucher (Director)	$0	$0

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990-PF

Filed on Sept. 26, 2018

Primary tax return for a private foundation's activities, finances, and governance

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XML

Fiscal Year Ending Dec.
2016

Revenue

$182,063

Expenses

$225,308

Net Income

-$43,245

Net Assets

$147,060

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$182,063	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$28,500	12.6%
Compensation of Officers*	$7,500	3.3%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$147,060
Total Liabilities	$0
Net Assets	$147,060

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Treasurer & Director)	$3,000	$0
Jose Montoya (Director)	$1,500	$0
Jack Remington (Director & Founder)	$0	$0
Michael Edmond (Director)	$0	$0
Camilla Graham (Director)	$0	$0

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990-PF

Filed on Nov. 3, 2017

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2015

Revenue

$150,443

Expenses

$238,184

Net Income

-$87,741

Net Assets

$190,305

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$150,443	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$28,500	12.0%
Compensation of Officers*	$10,918	4.6%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$190,305
Total Liabilities	$0
Net Assets	$190,305

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Treasurer, Clerk & Directo)	$3,000	$0
Jose Montoya (Director)	$1,500	$0
Michael Edmond (Director)	$1,500	$0
Camilla Graham (Director)	$1,000	$0
Jack Remington (Director)	$918	$0

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990-PF

Filed on April 9, 2016

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2014

Revenue

$208,620

Expenses

$220,265

Net Income

-$11,645

Net Assets

$278,046

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$208,620	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$31,500	14.3%
Compensation of Officers*	$8,000	3.6%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$278,046
Total Liabilities	$0
Net Assets	$278,046

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Treasurer, Clerk & Director)	$3,000	$0
Jose Montoya (Director)	$1,000	$0
Michael Edmond (Director)	$1,000	$0
Jack Remington (Director)	$0	$0
Camilla Graham (Director)	$0	$0

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990-PF

Filed on July 9, 2015

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2013

Revenue

$361,705

Expenses

$323,656

Net Income

$38,049

Net Assets

$285,191

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$361,705	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$45,000	13.9%
Compensation of Officers*	$8,000	2.5%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$285,191
Total Liabilities	$0
Net Assets	$285,191

Compensation

Key Employees and Officers	Compensation	Other
Richard Wenzel (President & Director)	$3,000	$0
Aw Karchmer (Treasurer, Clerk & Directo)	$3,000	$0
Kieran Marr (Director)	$1,000	$0
Carlos Del Rio (Director)	$1,000	$0
Jose Montoya (Director)	$0	$0
Jack Remington (Director)	$0	$0
Michael Scheld (Director)	$0	$0
Robert Schooley (Director)	$0	$0

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990-PF

Filed on Aug. 5, 2014

Primary tax return for a private foundation's activities, finances, and governance

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Fiscal Year Ending Dec.
2012

Revenue

$258,500

Expenses

$184,440

Net Income

$74,060

Net Assets

$247,141

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$258,500	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$43,500	23.6%
Compensation of Officers*	$7,750	4.2%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$247,142
Total Liabilities	$1
Net Assets	$247,141

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

Fiscal Year Ending Dec.
2011

Revenue

$323,228

Expenses

$276,134

Net Income

$47,094

Net Assets

$173,081

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$323,228	100%
Interest Revenue	$0
Dividends	$0
Sales of Assets	$0
Other Income	$0

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$38,500	13.9%
Compensation of Officers*	$6,500	2.4%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$173,082
Total Liabilities	$1
Net Assets	$173,081

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains information processed by the IRS during the 2012-2019 calendar years; this generally consists of filings for the 2011-2018 fiscal years, but may include older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

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Nonprofit Explorer has organizations claiming tax exemption in each of the 27 subsections of the 501(c) section of the tax code, and which have filed a Form 990, Form 990EZ or Form 990PF. Taxable trusts and private foundations that are required to file a form 990PF are also included. Small organizations filing a Form 990N "e-Postcard" are not included in this data.

Types of Nonprofits

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Updated March 23, 2026

Winter Course Of Infectious Diseases

Organization summary

Type of Nonprofit

Summary charts: organization finances over time

Revenue $221k (2024)

Expenses $167k (2024)

Total Assets $213k (2024)

Total Liabilities $0 (2024)

Tax Filings by Year

Fiscal Year Ending Dec. 2024

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2023

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2022

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2021

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2020

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2019

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2018

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2017

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2016

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2015

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2014

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2013

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

Revenue

$221k (2024)

Expenses

$167k (2024)

Total Assets

$213k (2024)

Total Liabilities

$0 (2024)

Fiscal Year Ending Dec.
2024

Fiscal Year Ending Dec.
2023

Fiscal Year Ending Dec.
2022

Fiscal Year Ending Dec.
2021

Fiscal Year Ending Dec.
2020

Fiscal Year Ending Dec.
2019

Fiscal Year Ending Dec.
2018

Fiscal Year Ending Dec.
2017

Fiscal Year Ending Dec.
2016

Fiscal Year Ending Dec.
2015

Fiscal Year Ending Dec.
2014

Fiscal Year Ending Dec.
2013

Fiscal Year Ending Dec.
2012

Fiscal Year Ending Dec.
2011

Fiscal Year Ending Dec.
2010

Fiscal Year Ending Dec.
2009

Fiscal Year Ending Dec.
2008

Fiscal Year Ending Dec.
2007

Fiscal Year Ending Dec.
2006

Fiscal Year Ending Dec.
2005

Fiscal Year Ending Dec.
2004